"RipperT @comcast.net>" <rippert<nospam> wrote in message
news:%23S1XVA6$GHA.1464@TK2MSFTNGP02.phx.gbl...
> Don't know if this group covers web apps, but here goes. In VS 2005, I am
> trying to get variables to hold thier values during postback from the
> server. I convert a text box's user-keyed value to an integer and assign
> it to a module level variable, then convert the variable and assign it to
> a hidden text box, setting it's EnableViewState to true so it returns with
> the reload. Then in the form's load event, I attempt to convert the
> contents of the hidden textbox back to an integer thus:
>
> intTotalCredits = Integer.Parse(Me.txtAccumCredits.Text)
>
> and assign it back to the variable and I get a format exception:
>
> "Input String was not in correct format."
>
> I've also tried this with a label.Text and the HiddenField.Value; same
> exception. I noticed that the line of code works fine in a sub, but not in
> the load event. What gives?
>
> Many thanx,
>
> Ripper
>
> PS: I'm following instructions in a VB textbook. I'm astounded there isn't
> an easier way to do this. I understand there used to be a module available
> that was unassociated with the web page, what happened to that?
>
>
>

"Scott M." <s-mar@nospam.nospam> wrote in message
news:Om3OKb6$GHA.3396@TK2MSFTNGP02.phx.gbl...
> The problem is this:
>
> intTotalCredits = Integer.Parse(Me.txtAccumCredits.Text)
>
> What if there is no number entered into the textbox though?  Are you using
> a validation control on this textbox to ensure only numeric data is
> entered?
>
> Use:  intTotalCredits = CType(txtAccumCredits.Text, Integer) instead
>
> Also (I can't help but to ask), What are you attempting to do here?  It
> seems like you are going to great lengths to to what ASP.NET already does
> for you.  You just want to send back down to the client the same data it
> posted up to the server?  EnableViewState does this for you with no code
> what-so-ever.
>
>
>
> "RipperT @comcast.net>" <rippert<nospam> wrote in message
> news:%23S1XVA6$GHA.1464@TK2MSFTNGP02.phx.gbl...
>> Don't know if this group covers web apps, but here goes. In VS 2005, I am
>> trying to get variables to hold thier values during postback from the
>> server. I convert a text box's user-keyed value to an integer and assign
>> it to a module level variable, then convert the variable and assign it to
>> a hidden text box, setting it's EnableViewState to true so it returns
>> with the reload. Then in the form's load event, I attempt to convert the
>> contents of the hidden textbox back to an integer thus:
>>
>> intTotalCredits = Integer.Parse(Me.txtAccumCredits.Text)
>>
>> and assign it back to the variable and I get a format exception:
>>
>> "Input String was not in correct format."
>>
>> I've also tried this with a label.Text and the HiddenField.Value; same
>> exception. I noticed that the line of code works fine in a sub, but not
>> in the load event. What gives?
>>
>> Many thanx,
>>
>> Ripper
>>
>> PS: I'm following instructions in a VB textbook. I'm astounded there
>> isn't an easier way to do this. I understand there used to be a module
>> available that was unassociated with the web page, what happened to that?
>>
>>
>>
>
>

"RipperT" <Ripp***@Nowhere.com> wrote in message
news:ualvKo6$GHA.4992@TK2MSFTNGP03.phx.gbl...
> Many thanx for the response. Sorry I've omitted an explanation. This is a
> class assignment. I am attempting to accumulate totals, as in
> intTotalCredits += intCredits, so I've got to retain the variable
> intTotalCredits on postback.
>
> I will try your suggestion. I've also just noticed that I am using the
> form_load event instead of the page_load event. Don't know if that makes a
> difference, but will find out! I'm a fish at this.
>
> Thanx again,
>
> Rip
>
>
> "Scott M." <s-mar@nospam.nospam> wrote in message
> news:Om3OKb6$GHA.3396@TK2MSFTNGP02.phx.gbl...
>> The problem is this:
>>
>> intTotalCredits = Integer.Parse(Me.txtAccumCredits.Text)
>>
>> What if there is no number entered into the textbox though?  Are you
>> using a validation control on this textbox to ensure only numeric data is
>> entered?
>>
>> Use:  intTotalCredits = CType(txtAccumCredits.Text, Integer) instead
>>
>> Also (I can't help but to ask), What are you attempting to do here?  It
>> seems like you are going to great lengths to to what ASP.NET already does
>> for you.  You just want to send back down to the client the same data it
>> posted up to the server?  EnableViewState does this for you with no code
>> what-so-ever.
>>
>>
>>
>> "RipperT @comcast.net>" <rippert<nospam> wrote in message
>> news:%23S1XVA6$GHA.1464@TK2MSFTNGP02.phx.gbl...
>>> Don't know if this group covers web apps, but here goes. In VS 2005, I
>>> am trying to get variables to hold thier values during postback from the
>>> server. I convert a text box's user-keyed value to an integer and assign
>>> it to a module level variable, then convert the variable and assign it
>>> to a hidden text box, setting it's EnableViewState to true so it returns
>>> with the reload. Then in the form's load event, I attempt to convert the
>>> contents of the hidden textbox back to an integer thus:
>>>
>>> intTotalCredits = Integer.Parse(Me.txtAccumCredits.Text)
>>>
>>> and assign it back to the variable and I get a format exception:
>>>
>>> "Input String was not in correct format."
>>>
>>> I've also tried this with a label.Text and the HiddenField.Value; same
>>> exception. I noticed that the line of code works fine in a sub, but not
>>> in the load event. What gives?
>>>
>>> Many thanx,
>>>
>>> Ripper
>>>
>>> PS: I'm following instructions in a VB textbook. I'm astounded there
>>> isn't an easier way to do this. I understand there used to be a module
>>> available that was unassociated with the web page, what happened to
>>> that?
>>>
>>>
>>>
>>
>>
>
>

"RipperT @comcast.net>" <rippert<nospam> wrote in message
news:uUWA8c$$GHA.4992@TK2MSFTNGP03.phx.gbl...
> intTotalCredits = Integer.Parse(Me.txtAccumCredits.Text) does not work:
>
> "Conversion from type string "" to 'integer' is not valid"
>
> As I said, if I put it in a sub, it works, but it doesn't work in the load
> event. I just don't get it.
> If anyone has any ideas, please help! And thanks!
>
> Rip
>
>
>
> "RipperT" <Ripp***@Nowhere.com> wrote in message
> news:ualvKo6$GHA.4992@TK2MSFTNGP03.phx.gbl...
>> Many thanx for the response. Sorry I've omitted an explanation. This is a
>> class assignment. I am attempting to accumulate totals, as in
>> intTotalCredits += intCredits, so I've got to retain the variable
>> intTotalCredits on postback.
>>
>> I will try your suggestion. I've also just noticed that I am using the
>> form_load event instead of the page_load event. Don't know if that makes
>> a difference, but will find out! I'm a fish at this.
>>
>> Thanx again,
>>
>> Rip
>>
>>
>> "Scott M." <s-mar@nospam.nospam> wrote in message
>> news:Om3OKb6$GHA.3396@TK2MSFTNGP02.phx.gbl...
>>> The problem is this:
>>>
>>> intTotalCredits = Integer.Parse(Me.txtAccumCredits.Text)
>>>
>>> What if there is no number entered into the textbox though?  Are you
>>> using a validation control on this textbox to ensure only numeric data
>>> is entered?
>>>
>>> Use:  intTotalCredits = CType(txtAccumCredits.Text, Integer) instead
>>>
>>> Also (I can't help but to ask), What are you attempting to do here?  It
>>> seems like you are going to great lengths to to what ASP.NET already
>>> does for you.  You just want to send back down to the client the same
>>> data it posted up to the server?  EnableViewState does this for you with
>>> no code what-so-ever.
>>>
>>>
>>>
>>> "RipperT @comcast.net>" <rippert<nospam> wrote in message
>>> news:%23S1XVA6$GHA.1464@TK2MSFTNGP02.phx.gbl...
>>>> Don't know if this group covers web apps, but here goes. In VS 2005, I
>>>> am trying to get variables to hold thier values during postback from
>>>> the server. I convert a text box's user-keyed value to an integer and
>>>> assign it to a module level variable, then convert the variable and
>>>> assign it to a hidden text box, setting it's EnableViewState to true so
>>>> it returns with the reload. Then in the form's load event, I attempt to
>>>> convert the contents of the hidden textbox back to an integer thus:
>>>>
>>>> intTotalCredits = Integer.Parse(Me.txtAccumCredits.Text)
>>>>
>>>> and assign it back to the variable and I get a format exception:
>>>>
>>>> "Input String was not in correct format."
>>>>
>>>> I've also tried this with a label.Text and the HiddenField.Value; same
>>>> exception. I noticed that the line of code works fine in a sub, but not
>>>> in the load event. What gives?
>>>>
>>>> Many thanx,
>>>>
>>>> Ripper
>>>>
>>>> PS: I'm following instructions in a VB textbook. I'm astounded there
>>>> isn't an easier way to do this. I understand there used to be a module
>>>> available that was unassociated with the web page, what happened to
>>>> that?
>>>>
>>>>
>>>>
>>>
>>>
>>
>>
>
>

"Scott M." <s-mar@nospam.nospam> wrote in message
news:uW$tRqCAHHA.204@TK2MSFTNGP04.phx.gbl...
> This message means that you didn't have any text in the textbox at the
> time. You must have numeric data in your textbox when you post the data
> back to the server.
>
> As for the ability to increase the data, all you need in Page_Load() is:
>
> 'Assume we already have a variable called "totalCredits"
> Dim i as Integer = CType(txtAccumCredits.Text, Integer) + totalCredits
> txtAccumCredits.Text = i.ToString()
>
> That's it, but as I said, you must have integer data in the textbox when
> you post back to the server. This is where a client-side validation
> control would help.
>
> Also, there is no "Form_Load()" event in ASP.NET at all, so that
> definitely wouldn't work.
>
> As for it working in a "sub", but not "Page_Load"... "Page_Load" is a sub
> and it is the correct place to do this work.
>
>
> "RipperT @comcast.net>" <rippert<nospam> wrote in message
> news:uUWA8c$$GHA.4992@TK2MSFTNGP03.phx.gbl...
>> intTotalCredits = Integer.Parse(Me.txtAccumCredits.Text) does not work:
>>
>> "Conversion from type string "" to 'integer' is not valid"
>>
>> As I said, if I put it in a sub, it works, but it doesn't work in the
>> load event. I just don't get it.
>> If anyone has any ideas, please help! And thanks!
>>
>> Rip
>>
>>
>>
>> "RipperT" <Ripp***@Nowhere.com> wrote in message
>> news:ualvKo6$GHA.4992@TK2MSFTNGP03.phx.gbl...
>>> Many thanx for the response. Sorry I've omitted an explanation. This is
>>> a class assignment. I am attempting to accumulate totals, as in
>>> intTotalCredits += intCredits, so I've got to retain the variable
>>> intTotalCredits on postback.
>>>
>>> I will try your suggestion. I've also just noticed that I am using the
>>> form_load event instead of the page_load event. Don't know if that makes
>>> a difference, but will find out! I'm a fish at this.
>>>
>>> Thanx again,
>>>
>>> Rip
>>>
>>>
>>> "Scott M." <s-mar@nospam.nospam> wrote in message
>>> news:Om3OKb6$GHA.3396@TK2MSFTNGP02.phx.gbl...
>>>> The problem is this:
>>>>
>>>> intTotalCredits = Integer.Parse(Me.txtAccumCredits.Text)
>>>>
>>>> What if there is no number entered into the textbox though?  Are you
>>>> using a validation control on this textbox to ensure only numeric data
>>>> is entered?
>>>>
>>>> Use:  intTotalCredits = CType(txtAccumCredits.Text, Integer) instead
>>>>
>>>> Also (I can't help but to ask), What are you attempting to do here?  It
>>>> seems like you are going to great lengths to to what ASP.NET already
>>>> does for you.  You just want to send back down to the client the same
>>>> data it posted up to the server?  EnableViewState does this for you
>>>> with no code what-so-ever.
>>>>
>>>>
>>>>
>>>> "RipperT @comcast.net>" <rippert<nospam> wrote in message
>>>> news:%23S1XVA6$GHA.1464@TK2MSFTNGP02.phx.gbl...
>>>>> Don't know if this group covers web apps, but here goes. In VS 2005, I
>>>>> am trying to get variables to hold thier values during postback from
>>>>> the server. I convert a text box's user-keyed value to an integer and
>>>>> assign it to a module level variable, then convert the variable and
>>>>> assign it to a hidden text box, setting it's EnableViewState to true
>>>>> so it returns with the reload. Then in the form's load event, I
>>>>> attempt to convert the contents of the hidden textbox back to an
>>>>> integer thus:
>>>>>
>>>>> intTotalCredits = Integer.Parse(Me.txtAccumCredits.Text)
>>>>>
>>>>> and assign it back to the variable and I get a format exception:
>>>>>
>>>>> "Input String was not in correct format."
>>>>>
>>>>> I've also tried this with a label.Text and the HiddenField.Value; same
>>>>> exception. I noticed that the line of code works fine in a sub, but
>>>>> not in the load event. What gives?
>>>>>
>>>>> Many thanx,
>>>>>
>>>>> Ripper
>>>>>
>>>>> PS: I'm following instructions in a VB textbook. I'm astounded there
>>>>> isn't an easier way to do this. I understand there used to be a module
>>>>> available that was unassociated with the web page, what happened to
>>>>> that?
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>
>>>
>>
>>
>
>

"RipperT" <Ripp***@Nowhere.com> wrote in message
news:%23eHTDiFAHHA.4348@TK2MSFTNGP04.phx.gbl...
> Thanks to all for your help. Scott, I will try your suggested code, but I
> want to first understand what is going on with the code I have.
>
> intTotalCredits comes from the selected index of a combo box that the user
> selects. When they click the button (I am using the value property of the
> hiddenField control here, but also tracking it using a visible label,
> which is not shown in code below):
>
> Dim intIndex As Integer
>
>
>
>
> With Me
>
>         intIndex = .cboCourse.SelectedIndex 'find index in array
>
>        intTotalCredits = courseDetails(intIndex).intNumberCredits 'plug #
> credits into intTotalCredits
>
> .hidTotalCredits.Value = intTotalCredits.ToString 'Assign # credits to
> hidden textbox
>
> End With
>
> Then on reload:
>
> Protected Sub Page_Load(ByVal sender As Object, ByVal e As
> System.EventArgs) Handles Me.Load
>
>    If IsPostBack And hidTotalCredits.Value <> "" Then
>
>        intTotalCredits = CType(hidTotalCredits.Value, Integer)
>
>    End If
>
> End Sub
>
> What happens is this: on initial load the value of intTotalCredits is 0,
> which is what I initialized it to when I declared it at module level. I
> select an item from the cboBox, click the button and the value of
> intTotalCredits comes up in my label as 0, even tho the selected index of
> the cboBox was 3. Then with the next cboBox selection and button click,
> the selected index gets plugged into intTotalCredits and it displays in my
> label. With the above code, why does intTotalCredits not show up until the
> 2nd postback?
>
> Thanx again,
>
> Rip
>
>
> "Scott M." <s-mar@nospam.nospam> wrote in message
> news:uW$tRqCAHHA.204@TK2MSFTNGP04.phx.gbl...
>> This message means that you didn't have any text in the textbox at the
>> time. You must have numeric data in your textbox when you post the data
>> back to the server.
>>
>> As for the ability to increase the data, all you need in Page_Load() is:
>>
>> 'Assume we already have a variable called "totalCredits"
>> Dim i as Integer = CType(txtAccumCredits.Text, Integer) + totalCredits
>> txtAccumCredits.Text = i.ToString()
>>
>> That's it, but as I said, you must have integer data in the textbox when
>> you post back to the server. This is where a client-side validation
>> control would help.
>>
>> Also, there is no "Form_Load()" event in ASP.NET at all, so that
>> definitely wouldn't work.
>>
>> As for it working in a "sub", but not "Page_Load"... "Page_Load" is a sub
>> and it is the correct place to do this work.
>>
>>
>> "RipperT @comcast.net>" <rippert<nospam> wrote in message
>> news:uUWA8c$$GHA.4992@TK2MSFTNGP03.phx.gbl...
>>> intTotalCredits = Integer.Parse(Me.txtAccumCredits.Text) does not work:
>>>
>>> "Conversion from type string "" to 'integer' is not valid"
>>>
>>> As I said, if I put it in a sub, it works, but it doesn't work in the
>>> load event. I just don't get it.
>>> If anyone has any ideas, please help! And thanks!
>>>
>>> Rip
>>>
>>>
>>>
>>> "RipperT" <Ripp***@Nowhere.com> wrote in message
>>> news:ualvKo6$GHA.4992@TK2MSFTNGP03.phx.gbl...
>>>> Many thanx for the response. Sorry I've omitted an explanation. This is
>>>> a class assignment. I am attempting to accumulate totals, as in
>>>> intTotalCredits += intCredits, so I've got to retain the variable
>>>> intTotalCredits on postback.
>>>>
>>>> I will try your suggestion. I've also just noticed that I am using the
>>>> form_load event instead of the page_load event. Don't know if that
>>>> makes a difference, but will find out! I'm a fish at this.
>>>>
>>>> Thanx again,
>>>>
>>>> Rip
>>>>
>>>>
>>>> "Scott M." <s-mar@nospam.nospam> wrote in message
>>>> news:Om3OKb6$GHA.3396@TK2MSFTNGP02.phx.gbl...
>>>>> The problem is this:
>>>>>
>>>>> intTotalCredits = Integer.Parse(Me.txtAccumCredits.Text)
>>>>>
>>>>> What if there is no number entered into the textbox though?  Are you
>>>>> using a validation control on this textbox to ensure only numeric data
>>>>> is entered?
>>>>>
>>>>> Use:  intTotalCredits = CType(txtAccumCredits.Text, Integer) instead
>>>>>
>>>>> Also (I can't help but to ask), What are you attempting to do here?
>>>>> It seems like you are going to great lengths to to what ASP.NET
>>>>> already does for you.  You just want to send back down to the client
>>>>> the same data it posted up to the server?  EnableViewState does this
>>>>> for you with no code what-so-ever.
>>>>>
>>>>>
>>>>>
>>>>> "RipperT @comcast.net>" <rippert<nospam> wrote in message
>>>>> news:%23S1XVA6$GHA.1464@TK2MSFTNGP02.phx.gbl...
>>>>>> Don't know if this group covers web apps, but here goes. In VS 2005,
>>>>>> I am trying to get variables to hold thier values during postback
>>>>>> from the server. I convert a text box's user-keyed value to an
>>>>>> integer and assign it to a module level variable, then convert the
>>>>>> variable and assign it to a hidden text box, setting it's
>>>>>> EnableViewState to true so it returns with the reload. Then in the
>>>>>> form's load event, I attempt to convert the contents of the hidden
>>>>>> textbox back to an integer thus:
>>>>>>
>>>>>> intTotalCredits = Integer.Parse(Me.txtAccumCredits.Text)
>>>>>>
>>>>>> and assign it back to the variable and I get a format exception:
>>>>>>
>>>>>> "Input String was not in correct format."
>>>>>>
>>>>>> I've also tried this with a label.Text and the HiddenField.Value;
>>>>>> same exception. I noticed that the line of code works fine in a sub,
>>>>>> but not in the load event. What gives?
>>>>>>
>>>>>> Many thanx,
>>>>>>
>>>>>> Ripper
>>>>>>
>>>>>> PS: I'm following instructions in a VB textbook. I'm astounded there
>>>>>> isn't an easier way to do this. I understand there used to be a
>>>>>> module available that was unassociated with the web page, what
>>>>>> happened to that?
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>
>>>
>>
>>
>
>

"Scott M." <s-mar@nospam.nospam> wrote in message
news:OM56wqHAHHA.4808@TK2MSFTNGP03.phx.gbl...
>I think you are making this much more complicated than it need be.  You
>won't need any hidden text fields or module level variables to make this
>work
>
> Also (just a few suggestions),  you should not be naming your variables
> with prefix that denotes the variable type (int) as this convention is no
> longer suggested.  Also, we do not have ComboBoxes in ASP.NET so the "cbo"
> prefix you are using is incorrect, use "lst" for list if you must use a
> prefix. Also, you are using the SelectedIndex from your listbox, but not
> the value of that selected index - is that really what you intended?
>
> You haven't provided all of your code (which you should do for best
> results around here), so I have to make some assumptions about what you
> are currently doing.
>
> Can you just post the entire page's code?
>
>
>
>
>
> "RipperT" <Ripp***@Nowhere.com> wrote in message
> news:%23eHTDiFAHHA.4348@TK2MSFTNGP04.phx.gbl...
>> Thanks to all for your help. Scott, I will try your suggested code, but I
>> want to first understand what is going on with the code I have.
>>
>> intTotalCredits comes from the selected index of a combo box that the
>> user selects. When they click the button (I am using the value property
>> of the hiddenField control here, but also tracking it using a visible
>> label, which is not shown in code below):
>>
>> Dim intIndex As Integer
>>
>>
>>
>>
>> With Me
>>
>>         intIndex = .cboCourse.SelectedIndex 'find index in array
>>
>>        intTotalCredits = courseDetails(intIndex).intNumberCredits 'plug #
>> credits into intTotalCredits
>>
>> .hidTotalCredits.Value = intTotalCredits.ToString 'Assign # credits to
>> hidden textbox
>>
>> End With
>>
>> Then on reload:
>>
>> Protected Sub Page_Load(ByVal sender As Object, ByVal e As
>> System.EventArgs) Handles Me.Load
>>
>>    If IsPostBack And hidTotalCredits.Value <> "" Then
>>
>>        intTotalCredits = CType(hidTotalCredits.Value, Integer)
>>
>>    End If
>>
>> End Sub
>>
>> What happens is this: on initial load the value of intTotalCredits is 0,
>> which is what I initialized it to when I declared it at module level. I
>> select an item from the cboBox, click the button and the value of
>> intTotalCredits comes up in my label as 0, even tho the selected index of
>> the cboBox was 3. Then with the next cboBox selection and button click,
>> the selected index gets plugged into intTotalCredits and it displays in
>> my label. With the above code, why does intTotalCredits not show up until
>> the 2nd postback?
>>
>> Thanx again,
>>
>> Rip
>>
>>
>> "Scott M." <s-mar@nospam.nospam> wrote in message
>> news:uW$tRqCAHHA.204@TK2MSFTNGP04.phx.gbl...
>>> This message means that you didn't have any text in the textbox at the
>>> time. You must have numeric data in your textbox when you post the data
>>> back to the server.
>>>
>>> As for the ability to increase the data, all you need in Page_Load() is:
>>>
>>> 'Assume we already have a variable called "totalCredits"
>>> Dim i as Integer = CType(txtAccumCredits.Text, Integer) + totalCredits
>>> txtAccumCredits.Text = i.ToString()
>>>
>>> That's it, but as I said, you must have integer data in the textbox when
>>> you post back to the server. This is where a client-side validation
>>> control would help.
>>>
>>> Also, there is no "Form_Load()" event in ASP.NET at all, so that
>>> definitely wouldn't work.
>>>
>>> As for it working in a "sub", but not "Page_Load"... "Page_Load" is a
>>> sub and it is the correct place to do this work.
>>>
>>>
>>> "RipperT @comcast.net>" <rippert<nospam> wrote in message
>>> news:uUWA8c$$GHA.4992@TK2MSFTNGP03.phx.gbl...
>>>> intTotalCredits = Integer.Parse(Me.txtAccumCredits.Text) does not work:
>>>>
>>>> "Conversion from type string "" to 'integer' is not valid"
>>>>
>>>> As I said, if I put it in a sub, it works, but it doesn't work in the
>>>> load event. I just don't get it.
>>>> If anyone has any ideas, please help! And thanks!
>>>>
>>>> Rip
>>>>
>>>>
>>>>
>>>> "RipperT" <Ripp***@Nowhere.com> wrote in message
>>>> news:ualvKo6$GHA.4992@TK2MSFTNGP03.phx.gbl...
>>>>> Many thanx for the response. Sorry I've omitted an explanation. This
>>>>> is a class assignment. I am attempting to accumulate totals, as in
>>>>> intTotalCredits += intCredits, so I've got to retain the variable
>>>>> intTotalCredits on postback.
>>>>>
>>>>> I will try your suggestion. I've also just noticed that I am using the
>>>>> form_load event instead of the page_load event. Don't know if that
>>>>> makes a difference, but will find out! I'm a fish at this.
>>>>>
>>>>> Thanx again,
>>>>>
>>>>> Rip
>>>>>
>>>>>
>>>>> "Scott M." <s-mar@nospam.nospam> wrote in message
>>>>> news:Om3OKb6$GHA.3396@TK2MSFTNGP02.phx.gbl...
>>>>>> The problem is this:
>>>>>>
>>>>>> intTotalCredits = Integer.Parse(Me.txtAccumCredits.Text)
>>>>>>
>>>>>> What if there is no number entered into the textbox though?  Are you
>>>>>> using a validation control on this textbox to ensure only numeric
>>>>>> data is entered?
>>>>>>
>>>>>> Use:  intTotalCredits = CType(txtAccumCredits.Text, Integer) instead
>>>>>>
>>>>>> Also (I can't help but to ask), What are you attempting to do here?
>>>>>> It seems like you are going to great lengths to to what ASP.NET
>>>>>> already does for you.  You just want to send back down to the client
>>>>>> the same data it posted up to the server?  EnableViewState does this
>>>>>> for you with no code what-so-ever.
>>>>>>
>>>>>>
>>>>>>
>>>>>> "RipperT @comcast.net>" <rippert<nospam> wrote in message
>>>>>> news:%23S1XVA6$GHA.1464@TK2MSFTNGP02.phx.gbl...
>>>>>>> Don't know if this group covers web apps, but here goes. In VS 2005,
>>>>>>> I am trying to get variables to hold thier values during postback
>>>>>>> from the server. I convert a text box's user-keyed value to an
>>>>>>> integer and assign it to a module level variable, then convert the
>>>>>>> variable and assign it to a hidden text box, setting it's
>>>>>>> EnableViewState to true so it returns with the reload. Then in the
>>>>>>> form's load event, I attempt to convert the contents of the hidden
>>>>>>> textbox back to an integer thus:
>>>>>>>
>>>>>>> intTotalCredits = Integer.Parse(Me.txtAccumCredits.Text)
>>>>>>>
>>>>>>> and assign it back to the variable and I get a format exception:
>>>>>>>
>>>>>>> "Input String was not in correct format."
>>>>>>>
>>>>>>> I've also tried this with a label.Text and the HiddenField.Value;
>>>>>>> same exception. I noticed that the line of code works fine in a sub,
>>>>>>> but not in the load event. What gives?
>>>>>>>
>>>>>>> Many thanx,
>>>>>>>
>>>>>>> Ripper
>>>>>>>
>>>>>>> PS: I'm following instructions in a VB textbook. I'm astounded there
>>>>>>> isn't an easier way to do this. I understand there used to be a
>>>>>>> module available that was unassociated with the web page, what
>>>>>>> happened to that?
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>
>>>
>>
>>
>
>

"Scott M." <s-mar@nospam.nospam> wrote in message
news:uMme1yOAHHA.4864@TK2MSFTNGP04.phx.gbl...
> Ok Rip, here are my thoughts on this......
>
> I believe the root of your problem stems from the Page_Load routine inside
> your If PostBack statement.  You were checking txtAccumCredits.Text to see
> if it was less than "" (txtAccumCredits.Text  < ""), rather than checking
> to see if it was equal to an empty string (txtAccumCredits.Text <> "").
> You can't check a string to see if it is less than an empty string.  This
> would be the cause for your invalid cast exception messages.
>
> It also seems that you are changing the value of txtAccumCredits.Text in
> contradictory ways.  You are setting a value for this in the Page_Load
> when Postback occurs and there is already a value for txtAccumCredits.Text
> and you are then continuing to the button_click event handler where the
> data you just wrote into the textbox is changed to the # of credits for
> the selected course, not the accumulated credit total.  This is something
> you'll need to work out since I'm not sure what answer you actually intend
> to get.
>
> Also, if you look at the code below, I have taken the liberty of modifying
> it a little and made comments explaining what I've modified and why.
>
> Option Strict On
>
> 'This VS .NET setting should already be on by default.
> 'So, if you are using VS.NET (VS 2005), you don't need this
> Option Explicit On
>
> Partial Class _Default
> Inherits System.Web.UI.Page
>
> 'I've removed the data type prefixes from all the constant
> 'and variable names as this is no longer considered to be
> 'a best practice (hasn't been for 5 years now).
>
> Private Const REG_FEE As Decimal = 25D
> Private Const ONLINE_FEE As Decimal = 10D
> Private Const RESIDENT_TUITION As Decimal = 67D
> Private Const NON_DISTRICT_TUITION As Decimal = 120D
> Private Const NON_STATE_TUITION As Decimal = 180D
> Private Const INTERNATIONAL_TUITION As Decimal = 180D
> Private Const FACILITIES_FEE As Decimal = 5D
>
> Friend totalTuition As Decimal = 0D
> Friend totalFees As Decimal = 0D
> Friend totalCredits As Integer = 0I
> Friend totalCost As Decimal = 0D
>
> Public Structure Course
>  Dim courseCode As String
> Dim courseFee As Decimal
> Dim numberCredits As Integer
> End Structure
>
> Private courseDetails(16) As Course
>
> Protected Sub btnSelectCourse_Click(ByVal sender As Object, _
> ByVal e As System.EventArgs) Handles btnSelectCourse.Click
>
>  'find index in array
> 'Note the change of name for the drop down list
> 'since there aren't any combo boxes in ASP.NET
>  Dim index As Integer = lstCourse.SelectedIndex
>
>  'plug # credits into totalCredits
>  totalCredits = courseDetails(index).numberCredits
>
>  'Assign # credits to hidden textbox
>  txtAccumCredits.Text = totalCredits.ToString
> End Sub
>
>
> Protected Sub btnClear_Click(ByVal sender As Object, _
> ByVal e As System.EventArgs) Handles btnClear.Click
>
>  ' =============================================
>  ' Clear form
>  ' =============================================
>
>  txtFirstName.Text = String.Empty
>  txtLastName.Text = String.Empty
>  txtStudentID.Text = String.Empty
>  txtEmailAddress.Text = String.Empty
>  radioResidencyStatus.SelectedIndex = 0
>   cboCourse.SelectedIndex = 0
>   txtAccumCredits.Text = ""
> End Sub
>
> Protected Sub Page_Load(ByVal sender As Object, _
> ByVal e As System.EventArgs)
>  Handles Me.Load
>
> 'You can't do math comparisons with string data
> 'as in your original line of code below.
>  'If IsPostBack And txtAccumCredits.Text < "" Then
>
> 'The line should be...
> If IsPostBack AndAlso txtAccumCredits.Text <> "" Then
>   Dim i As Integer = CType(txtAccumCredits.Text, Integer) + totalCredits
>   txtAccumCredits.Text += i.ToString
>  End If
>
>  courseDetails(0).courseCode = "CITA110"
>  courseDetails(0).courseFee = 12D
>  courseDetails(0).numberCredits = 3I
>  courseDetails(1).courseCode = "CITA110"
>  courseDetails(1).courseFee = 12D
>  courseDetails(1).numberCredits = 3I
>  courseDetails(2).courseCode = "CITA115"
>  courseDetails(2).courseFee = 45D
>  courseDetails(2).numberCredits = 3I
>  courseDetails(3).courseCode = "CITA115"
>  courseDetails(3).courseFee = 45D
>  courseDetails(3).numberCredits = 3I
>  courseDetails(4).courseCode = "CITA126"
>  courseDetails(4).courseFee = 45D
>  courseDetails(4).numberCredits = 3I
>  courseDetails(5).courseCode = "CITA126"
>  courseDetails(5).courseFee = 45D
>  courseDetails(5).numberCredits = 3I
>  courseDetails(6).courseCode = "CITA210"
>  courseDetails(6).courseFee = 12D
>  courseDetails(6).numberCredits = 3I
>  courseDetails(7).courseCode = "CITA210"
>  courseDetails(7).courseFee = 12D
>  courseDetails(7).numberCredits = 3I
>  courseDetails(8).courseCode = "CITP110"
>  courseDetails(8).courseFee = 15D
>  courseDetails(8).numberCredits = 4I
>  courseDetails(9).courseCode = "CITP110"
>  courseDetails(9).courseFee = 15D
>  courseDetails(9).numberCredits = 4I
>  courseDetails(10).courseCode = "CITP150"
>  courseDetails(10).courseFee = 20D
>  courseDetails(10).numberCredits = 4I
>  courseDetails(11).courseCode = "CITP150"
>  courseDetails(11).courseFee = 20D
>  courseDetails(11).numberCredits = 4I
>  courseDetails(12).courseCode = "CITP190"
>  courseDetails(12).courseFee = 15D
>  courseDetails(12).numberCredits = 3I
>  courseDetails(13).courseCode = "CITP190"
>  courseDetails(13).courseFee = 15D
>  courseDetails(13).numberCredits = 3I
>  courseDetails(14).courseCode = "CITP200"
>  courseDetails(14).courseFee = 12D
>  courseDetails(14).numberCredits = 3I
>  courseDetails(15).courseCode = "CITD120"
>  courseDetails(15).courseFee = 10D
>  courseDetails(15).numberCredits = 2I
>  courseDetails(16).courseCode = "CITD120"
>  courseDetails(16).courseFee = 10D
>  courseDetails(16).numberCredits = 2I
> End Sub
>
> End Class
>
>

"RipperT" <Ripp***@Nowhere.com> schreef in bericht
news:ualvKo6$GHA.4992@TK2MSFTNGP03.phx.gbl...
> Many thanx for the response. Sorry I've omitted an explanation. This is a
> class assignment. I am attempting to accumulate totals, as in
> intTotalCredits += intCredits, so I've got to retain the variable
> intTotalCredits on postback.
>
> I will try your suggestion. I've also just noticed that I am using the
> form_load event instead of the page_load event. Don't know if that makes a
> difference, but will find out! I'm a fish at this.
>
> Thanx again,
>
> Rip
>
>
> "Scott M." <s-mar@nospam.nospam> wrote in message
> news:Om3OKb6$GHA.3396@TK2MSFTNGP02.phx.gbl...
>> The problem is this:
>>
>> intTotalCredits = Integer.Parse(Me.txtAccumCredits.Text)
>>
>> What if there is no number entered into the textbox though?  Are you
>> using a validation control on this textbox to ensure only numeric data is
>> entered?
>>
>> Use:  intTotalCredits = CType(txtAccumCredits.Text, Integer) instead
>>
>> Also (I can't help but to ask), What are you attempting to do here?  It
>> seems like you are going to great lengths to to what ASP.NET already does
>> for you.  You just want to send back down to the client the same data it
>> posted up to the server?  EnableViewState does this for you with no code
>> what-so-ever.
>>
>>
>>
>> "RipperT @comcast.net>" <rippert<nospam> wrote in message
>> news:%23S1XVA6$GHA.1464@TK2MSFTNGP02.phx.gbl...
>>> Don't know if this group covers web apps, but here goes. In VS 2005, I
>>> am trying to get variables to hold thier values during postback from the
>>> server. I convert a text box's user-keyed value to an integer and assign
>>> it to a module level variable, then convert the variable and assign it
>>> to a hidden text box, setting it's EnableViewState to true so it returns
>>> with the reload. Then in the form's load event, I attempt to convert the
>>> contents of the hidden textbox back to an integer thus:
>>>
>>> intTotalCredits = Integer.Parse(Me.txtAccumCredits.Text)
>>>
>>> and assign it back to the variable and I get a format exception:
>>>
>>> "Input String was not in correct format."
>>>
>>> I've also tried this with a label.Text and the HiddenField.Value; same
>>> exception. I noticed that the line of code works fine in a sub, but not
>>> in the load event. What gives?
>>>
>>> Many thanx,
>>>
>>> Ripper
>>>
>>> PS: I'm following instructions in a VB textbook. I'm astounded there
>>> isn't an easier way to do this. I understand there used to be a module
>>> available that was unassociated with the web page, what happened to
>>> that?
>>>
>>>
>>>
>>
>>
>
>