"Siva M" wrote:

> There are at least couple of ways to do this: 1. Filtering the charaters in
> the Keypress event of the textbox itself 2. Using regular expressions to
> find invalid character in the textbox. See which one works ut for you...
>
> <ameen.abdul***@gmail.com> wrote in message
> news:1156777910.929069.214270@i42g2000cwa.googlegroups.com...
> Hi Guys,
>
> I have a textbox in windows form that should only accept alphabets,
> numbers, spaces and underscore. If the textbox contains anyother
> character it should display a msg at the time of validation.. Is there
> any funciton in vb.net for this? or any other way??
>
>
> Waiting for ur replies...
>
> Thanks in adv.
>
>

"Dennis" <Den***@discussions.microsoft.com> wrote in message
news:DC678667-0480-457C-BF94-F403CC18DC80@microsoft.com...
> Using the KeyPress event does not preclude the user from cutting from some
> other source and pasting invalid chars into the text box.  Use the
> textbox's
> "Validating" event to check the text for non-alpha characters.
> --
> Dennis in Houston
>
>
> "Siva M" wrote:
>
>> There are at least couple of ways to do this: 1. Filtering the charaters
>> in
>> the Keypress event of the textbox itself 2. Using regular expressions to
>> find invalid character in the textbox. See which one works ut for you...
>>
>> <ameen.abdul***@gmail.com> wrote in message
>> news:1156777910.929069.214270@i42g2000cwa.googlegroups.com...
>> Hi Guys,
>>
>> I have a textbox in windows form that should only accept alphabets,
>> numbers, spaces and underscore. If the textbox contains anyother
>> character it should display a msg at the time of validation.. Is there
>> any funciton in vb.net for this? or any other way??
>>
>>
>> Waiting for ur replies...
>>
>> Thanks in adv.
>>
>>

"Claes Bergefall" wrote:

> If you want to prevent illegal characters from being pasted you can use this
> code:
>
> Protected Overrides Function ProcessCmdKey(ByRef msg As
> System.Windows.Forms.Message, ByVal keyData As System.Windows.Forms.Keys) As
> Boolean
>         'Need to prevent pasting of invalid characters
>         If keyData = (Keys.Shift Or Keys.Insert) OrElse keyData =
> (Keys.Control Or Keys.V) Then
>             Dim data As IDataObject = Clipboard.GetDataObject
>             If data Is Nothing Then
>                 Return MyBase.ProcessCmdKey(msg, keyData)
>             Else
>                 Dim text As String =
> CStr(data.GetData(DataFormats.StringFormat, True))
>                 If text = String.Empty Then
>                     Return MyBase.ProcessCmdKey(msg, keyData)
>                 Else
>                     For Each ch As Char In text.ToCharArray
>                         If Not IsValid(ch) Then
>                             Return True
>                         End If
>                     Next
>                     Return MyBase.ProcessCmdKey(msg, keyData)
>                 End If
>             End If
>         Else
>             Return MyBase.ProcessCmdKey(msg, keyData)
>         End If
>     End Function
>
> Private Function IsValid(ByVal ch As Char) As Boolean
>     'TODO: Check if the character is valid
> End Function
>
> The above will prevent pasting if the text contains any illegal characters.
>
>    /claes
>
> "Dennis" <Den***@discussions.microsoft.com> wrote in message
> news:DC678667-0480-457C-BF94-F403CC18DC80@microsoft.com...
> > Using the KeyPress event does not preclude the user from cutting from some
> > other source and pasting invalid chars into the text box.  Use the
> > textbox's
> > "Validating" event to check the text for non-alpha characters.
> > --
> > Dennis in Houston
> >
> >
> > "Siva M" wrote:
> >
> >> There are at least couple of ways to do this: 1. Filtering the charaters
> >> in
> >> the Keypress event of the textbox itself 2. Using regular expressions to
> >> find invalid character in the textbox. See which one works ut for you...
> >>
> >> <ameen.abdul***@gmail.com> wrote in message
> >> news:1156777910.929069.214270@i42g2000cwa.googlegroups.com...
> >> Hi Guys,
> >>
> >> I have a textbox in windows form that should only accept alphabets,
> >> numbers, spaces and underscore. If the textbox contains anyother
> >> character it should display a msg at the time of validation.. Is there
> >> any funciton in vb.net for this? or any other way??
> >>
> >>
> >> Waiting for ur replies...
> >>
> >> Thanks in adv.
> >>
> >>
>
>
>

"Dennis" <Den***@discussions.microsoft.com> wrote in message
news:72A55D9A-CA67-45A7-92B9-2BC60FF95833@microsoft.com...
>I believe you have to subclass the textbox to override the ProcessCmdKey
> whereas with the validating event you don't have to do any subclassing.
> it's
> easier to work with at design time.
> --
> Dennis in Houston
>
>
> "Claes Bergefall" wrote:
>
>> If you want to prevent illegal characters from being pasted you can use
>> this
>> code:
>>
>> Protected Overrides Function ProcessCmdKey(ByRef msg As
>> System.Windows.Forms.Message, ByVal keyData As System.Windows.Forms.Keys)
>> As
>> Boolean
>>         'Need to prevent pasting of invalid characters
>>         If keyData = (Keys.Shift Or Keys.Insert) OrElse keyData =
>> (Keys.Control Or Keys.V) Then
>>             Dim data As IDataObject = Clipboard.GetDataObject
>>             If data Is Nothing Then
>>                 Return MyBase.ProcessCmdKey(msg, keyData)
>>             Else
>>                 Dim text As String =
>> CStr(data.GetData(DataFormats.StringFormat, True))
>>                 If text = String.Empty Then
>>                     Return MyBase.ProcessCmdKey(msg, keyData)
>>                 Else
>>                     For Each ch As Char In text.ToCharArray
>>                         If Not IsValid(ch) Then
>>                             Return True
>>                         End If
>>                     Next
>>                     Return MyBase.ProcessCmdKey(msg, keyData)
>>                 End If
>>             End If
>>         Else
>>             Return MyBase.ProcessCmdKey(msg, keyData)
>>         End If
>>     End Function
>>
>> Private Function IsValid(ByVal ch As Char) As Boolean
>>     'TODO: Check if the character is valid
>> End Function
>>
>> The above will prevent pasting if the text contains any illegal
>> characters.
>>
>>    /claes
>>
>> "Dennis" <Den***@discussions.microsoft.com> wrote in message
>> news:DC678667-0480-457C-BF94-F403CC18DC80@microsoft.com...
>> > Using the KeyPress event does not preclude the user from cutting from
>> > some
>> > other source and pasting invalid chars into the text box.  Use the
>> > textbox's
>> > "Validating" event to check the text for non-alpha characters.
>> > --
>> > Dennis in Houston
>> >
>> >
>> > "Siva M" wrote:
>> >
>> >> There are at least couple of ways to do this: 1. Filtering the
>> >> charaters
>> >> in
>> >> the Keypress event of the textbox itself 2. Using regular expressions
>> >> to
>> >> find invalid character in the textbox. See which one works ut for
>> >> you...
>> >>
>> >> <ameen.abdul***@gmail.com> wrote in message
>> >> news:1156777910.929069.214270@i42g2000cwa.googlegroups.com...
>> >> Hi Guys,
>> >>
>> >> I have a textbox in windows form that should only accept alphabets,
>> >> numbers, spaces and underscore. If the textbox contains anyother
>> >> character it should display a msg at the time of validation.. Is there
>> >> any funciton in vb.net for this? or any other way??
>> >>
>> >>
>> >> Waiting for ur replies...
>> >>
>> >> Thanks in adv.
>> >>
>> >>
>>
>>
>>