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save treeview state and call from another formAs a follow up of my previous question concerning calling functions from another form I created this: Public Class TreeViewState Inherits Explorer1 Private tt As New Dictionary(Of String, Boolean) Public Sub RestoreTreeViewExpandedState() Dim i As Integer For i = 0 To TreeView.Nodes.Count - 1 If tt.ContainsKey(TreeView.Nodes(i).Name) Then If tt(TreeView.Nodes(i).Name) Then TreeView.Nodes(i).Expand() Else TreeView.Nodes(i).Collapse() End If End If Next End Sub Public Function SaveTreeState() Dim i As Integer For i = 0 To TreeView.Nodes.Count - 1 If TreeView.Nodes(i).Nodes.Count > 0 Then tt.Add(TreeView.Nodes(i).Name, TreeView.Nodes (i).IsExpanded) End If Next Return tt End Function End Class This class will save the status of the treeview on form Explorer1. I want to call the functions in this class from another form, frmZoeken: Dim currentState As TreeViewState currentState.SaveTreeState() SaveQueryInTreeview() currentUser.RestoreTreeViewExpandedState() I get an error when I try this obect reference not set to an instance of an object Marco. On Mon, 25 May 2009 06:07:19 -0700 (PDT), Co <vonclausow***@gmail.com>
wrote: Show quoteHide quote >Hi All, This is exactly the same problem you had yesterday or the day before.> >As a follow up of my previous question concerning calling functions >from another form I created this: > >Public Class TreeViewState > Inherits Explorer1 > Private tt As New Dictionary(Of String, Boolean) > > Public Sub RestoreTreeViewExpandedState() > > Dim i As Integer > For i = 0 To TreeView.Nodes.Count - 1 > > If tt.ContainsKey(TreeView.Nodes(i).Name) Then > > If tt(TreeView.Nodes(i).Name) Then > TreeView.Nodes(i).Expand() > Else > TreeView.Nodes(i).Collapse() > End If > End If > Next > End Sub > > Public Function SaveTreeState() > > Dim i As Integer > > For i = 0 To TreeView.Nodes.Count - 1 > > If TreeView.Nodes(i).Nodes.Count > 0 Then > tt.Add(TreeView.Nodes(i).Name, TreeView.Nodes >(i).IsExpanded) > End If > Next > > Return tt > End Function > >End Class > >This class will save the status of the treeview on form Explorer1. >I want to call the functions in this class from another form, >frmZoeken: > >Dim currentState As TreeViewState >currentState.SaveTreeState() >SaveQueryInTreeview() >currentUser.RestoreTreeViewExpandedState() > >I get an error when I try this obect reference not set to an instance >of an object > >Marco. You are creating a variable (currentState) but not setting it to an object. Also, again you are telling us about an error but not telling us on which line the error occurs. Any of these will create a new object: Dim currentState As New TreeViewState Dim currentState As TreeViewState = New TreeViewState Dim currentState As TreeViewState currentState = New TreeViewState I don't like the fact that in this class you keep referring to an object called "TreeView". It would be better if you added a parameter to the New() of the TreeViewState class which is a reference to the TreeView the class is to operate on. That way you could use this class for any TreeView object. On 25 mei, 17:10, Jack Jackson <jjackson-***@cinnovations.net> wrote:
Show quoteHide quote > On Mon, 25 May 2009 06:07:19 -0700 (PDT), Co <vonclausow***@gmail.com> Jack,> wrote: > > > > >Hi All, > > >As a follow up of my previous question concerning calling functions > >from another form I created this: > > >Public Class TreeViewState > > Inherits Explorer1 > > Private tt As New Dictionary(Of String, Boolean) > > > Public Sub RestoreTreeViewExpandedState() > > > Dim i As Integer > > For i = 0 To TreeView.Nodes.Count - 1 > > > If tt.ContainsKey(TreeView.Nodes(i).Name) Then > > > If tt(TreeView.Nodes(i).Name) Then > > TreeView.Nodes(i).Expand() > > Else > > TreeView.Nodes(i).Collapse() > > End If > > End If > > Next > > End Sub > > > Public Function SaveTreeState() > > > Dim i As Integer > > > For i = 0 To TreeView.Nodes.Count - 1 > > > If TreeView.Nodes(i).Nodes.Count > 0 Then > > tt.Add(TreeView.Nodes(i).Name, TreeView.Nodes > >(i).IsExpanded) > > End If > > Next > > > Return tt > > End Function > > >End Class > > >This class will save the status of the treeview on form Explorer1. > >I want to call the functions in this class from another form, > >frmZoeken: > > >Dim currentState As TreeViewState > >currentState.SaveTreeState() > >SaveQueryInTreeview() > >currentUser.RestoreTreeViewExpandedState() > > >I get an error when I try this obect reference not set to an instance > >of an object > > >Marco. > > This is exactly the same problem you had yesterday or the day before. > You are creating a variable (currentState) but not setting it to an > object. Also, again you are telling us about an error but not telling > us on which line the error occurs. > > Any of these will create a new object: > Dim currentState As New TreeViewState > > Dim currentState As TreeViewState = New TreeViewState > > Dim currentState As TreeViewState > currentState = New TreeViewState > > I don't like the fact that in this class you keep referring to an > object called "TreeView". It would be better if you added a parameter > to the New() of the TreeViewState class which is a reference to the > TreeView the class is to operate on. That way you could use this > class for any TreeView object. could you please show me how this Sub New() would look like and tell me how I can create a New object for a Treeview which is shown on my Explorer1 form? You know what I don't understand is why you just can't call something which is already there. Why creating a new instance? I mean when I create a new instance I will use that newly created object instead of the one already on Explorer1 form. Marco I presume that you have used the debugger to prove that the code in LoadTree
is being executed and that the new data is being included in the query and is appearing in the dt.Rows.Add line and you can see it in dt when the AddNodes method is executed. If not, then that is what you need to confirm. If the new data is in dt and if the Select is returning the correct result then your problem is that the line AddNodes(TreeView.Nodes, dt.Select("ISNULL(IDParent, -1) =-1")) is updating the wrong instance of a TreeView, and this comes back to the core of your issues. It seems that you may not have a clear understanding of the distinction between classes, instances of a class, and a variables. In particular, that variables are not the same as a class instance, that more than one variable can refer to the same class instance, that the instance which a variable refers to can be changed, and that a variable may refer to no instance. As an example, you are talking about creating an object when I think you are actually wanting to create a reference to an object - two very different things. The debugging you need to do will probably come down to proving that the AddNodes is insertng the data into the correct instance of your TreeView. "Co" <vonclausow***@gmail.com> wrote in message On 25 mei, 17:10, Jack Jackson <jjackson-***@cinnovations.net> wrote:news:5a537f3d-26cd-4450-a911-fec9185bd65c@y9g2000yqg.googlegroups.com... Show quoteHide quote > On Mon, 25 May 2009 06:07:19 -0700 (PDT), Co <vonclausow***@gmail.com> Jack,> wrote: > > > > >Hi All, > > >As a follow up of my previous question concerning calling functions > >from another form I created this: > > >Public Class TreeViewState > > Inherits Explorer1 > > Private tt As New Dictionary(Of String, Boolean) > > > Public Sub RestoreTreeViewExpandedState() > > > Dim i As Integer > > For i = 0 To TreeView.Nodes.Count - 1 > > > If tt.ContainsKey(TreeView.Nodes(i).Name) Then > > > If tt(TreeView.Nodes(i).Name) Then > > TreeView.Nodes(i).Expand() > > Else > > TreeView.Nodes(i).Collapse() > > End If > > End If > > Next > > End Sub > > > Public Function SaveTreeState() > > > Dim i As Integer > > > For i = 0 To TreeView.Nodes.Count - 1 > > > If TreeView.Nodes(i).Nodes.Count > 0 Then > > tt.Add(TreeView.Nodes(i).Name, TreeView.Nodes > >(i).IsExpanded) > > End If > > Next > > > Return tt > > End Function > > >End Class > > >This class will save the status of the treeview on form Explorer1. > >I want to call the functions in this class from another form, > >frmZoeken: > > >Dim currentState As TreeViewState > >currentState.SaveTreeState() > >SaveQueryInTreeview() > >currentUser.RestoreTreeViewExpandedState() > > >I get an error when I try this obect reference not set to an instance > >of an object > > >Marco. > > This is exactly the same problem you had yesterday or the day before. > You are creating a variable (currentState) but not setting it to an > object. Also, again you are telling us about an error but not telling > us on which line the error occurs. > > Any of these will create a new object: > Dim currentState As New TreeViewState > > Dim currentState As TreeViewState = New TreeViewState > > Dim currentState As TreeViewState > currentState = New TreeViewState > > I don't like the fact that in this class you keep referring to an > object called "TreeView". It would be better if you added a parameter > to the New() of the TreeViewState class which is a reference to the > TreeView the class is to operate on. That way you could use this > class for any TreeView object. could you please show me how this Sub New() would look like and tell me how I can create a New object for a Treeview which is shown on my Explorer1 form? You know what I don't understand is why you just can't call something which is already there. Why creating a new instance? I mean when I create a new instance I will use that newly created object instead of the one already on Explorer1 form. Marco On Mon, 25 May 2009 08:44:19 -0700 (PDT), Co <vonclausow***@gmail.com>
wrote: Show quoteHide quote >On 25 mei, 17:10, Jack Jackson <jjackson-***@cinnovations.net> wrote: If you already have an object, you use that object, you don't create a>> On Mon, 25 May 2009 06:07:19 -0700 (PDT), Co <vonclausow***@gmail.com> >> wrote: >> >> >> >> >Hi All, >> >> >As a follow up of my previous question concerning calling functions >> >from another form I created this: >> >> >Public Class TreeViewState >> > Inherits Explorer1 >> > Private tt As New Dictionary(Of String, Boolean) >> >> > Public Sub RestoreTreeViewExpandedState() >> >> > Dim i As Integer >> > For i = 0 To TreeView.Nodes.Count - 1 >> >> > If tt.ContainsKey(TreeView.Nodes(i).Name) Then >> >> > If tt(TreeView.Nodes(i).Name) Then >> > TreeView.Nodes(i).Expand() >> > Else >> > TreeView.Nodes(i).Collapse() >> > End If >> > End If >> > Next >> > End Sub >> >> > Public Function SaveTreeState() >> >> > Dim i As Integer >> >> > For i = 0 To TreeView.Nodes.Count - 1 >> >> > If TreeView.Nodes(i).Nodes.Count > 0 Then >> > tt.Add(TreeView.Nodes(i).Name, TreeView.Nodes >> >(i).IsExpanded) >> > End If >> > Next >> >> > Return tt >> > End Function >> >> >End Class >> >> >This class will save the status of the treeview on form Explorer1. >> >I want to call the functions in this class from another form, >> >frmZoeken: >> >> >Dim currentState As TreeViewState >> >currentState.SaveTreeState() >> >SaveQueryInTreeview() >> >currentUser.RestoreTreeViewExpandedState() >> >> >I get an error when I try this obect reference not set to an instance >> >of an object >> >> >Marco. >> >> This is exactly the same problem you had yesterday or the day before. >> You are creating a variable (currentState) but not setting it to an >> object. Also, again you are telling us about an error but not telling >> us on which line the error occurs. >> >> Any of these will create a new object: >> Dim currentState As New TreeViewState >> >> Dim currentState As TreeViewState = New TreeViewState >> >> Dim currentState As TreeViewState >> currentState = New TreeViewState >> >> I don't like the fact that in this class you keep referring to an >> object called "TreeView". It would be better if you added a parameter >> to the New() of the TreeViewState class which is a reference to the >> TreeView the class is to operate on. That way you could use this >> class for any TreeView object. > >Jack, > >could you please show me how this Sub New() >would look like and tell me how I can create a New object >for a Treeview which is shown on my Explorer1 form? > >You know what I don't understand is why you just can't call >something which is already there. Why creating a new instance? >I mean when I create a new instance I will use that newly created >object >instead of the one already on Explorer1 form. > >Marco new one. I never said you should create a New Treeview. As I showed you in my previous message, the problem was with TreeViewState. You never initialized the currentState variable. You either need to set it to an existing TreeViewState object, or you need to create a new one. On 26 mei, 05:27, Jack Jackson <jjackson-***@cinnovations.net> wrote:
Show quoteHide quote > On Mon, 25 May 2009 08:44:19 -0700 (PDT), Co <vonclausow***@gmail.com> Jack,> wrote: > > > > > > >On 25 mei, 17:10, Jack Jackson <jjackson-***@cinnovations.net> wrote: > >> On Mon, 25 May 2009 06:07:19 -0700 (PDT), Co <vonclausow***@gmail.com> > >> wrote: > > >> >Hi All, > > >> >As a follow up of my previous question concerning calling functions > >> >from another form I created this: > > >> >Public Class TreeViewState > >> > Inherits Explorer1 > >> > Private tt As New Dictionary(Of String, Boolean) > > >> > Public Sub RestoreTreeViewExpandedState() > > >> > Dim i As Integer > >> > For i = 0 To TreeView.Nodes.Count - 1 > > >> > If tt.ContainsKey(TreeView.Nodes(i).Name) Then > > >> > If tt(TreeView.Nodes(i).Name) Then > >> > TreeView.Nodes(i).Expand() > >> > Else > >> > TreeView.Nodes(i).Collapse() > >> > End If > >> > End If > >> > Next > >> > End Sub > > >> > Public Function SaveTreeState() > > >> > Dim i As Integer > > >> > For i = 0 To TreeView.Nodes.Count - 1 > > >> > If TreeView.Nodes(i).Nodes.Count > 0 Then > >> > tt.Add(TreeView.Nodes(i).Name, TreeView.Nodes > >> >(i).IsExpanded) > >> > End If > >> > Next > > >> > Return tt > >> > End Function > > >> >End Class > > >> >This class will save the status of the treeview on form Explorer1. > >> >I want to call the functions in this class from another form, > >> >frmZoeken: > > >> >Dim currentState As TreeViewState > >> >currentState.SaveTreeState() > >> >SaveQueryInTreeview() > >> >currentUser.RestoreTreeViewExpandedState() > > >> >I get an error when I try this obect reference not set to an instance > >> >of an object > > >> >Marco. > > >> This is exactly the same problem you had yesterday or the day before. > >> You are creating a variable (currentState) but not setting it to an > >> object. Also, again you are telling us about an error but not telling > >> us on which line the error occurs. > > >> Any of these will create a new object: > >> Dim currentState As New TreeViewState > > >> Dim currentState As TreeViewState = New TreeViewState > > >> Dim currentState As TreeViewState > >> currentState = New TreeViewState > > >> I don't like the fact that in this class you keep referring to an > >> object called "TreeView". It would be better if you added a parameter > >> to the New() of the TreeViewState class which is a reference to the > >> TreeView the class is to operate on. That way you could use this > >> class for any TreeView object. > > >Jack, > > >could you please show me how this Sub New() > >would look like and tell me how I can create a New object > >for a Treeview which is shown on my Explorer1 form? > > >You know what I don't understand is why you just can't call > >something which is already there. Why creating a new instance? > >I mean when I create a new instance I will use that newly created > >object > >instead of the one already on Explorer1 form. > > >Marco > > If you already have an object, you use that object, you don't create a > new one. I never said you should create a New Treeview. As I showed > you in my previous message, the problem was with TreeViewState. You > never initialized the currentState variable. You either need to set > it to an existing TreeViewState object, or you need to create a new > one.- Tekst uit oorspronkelijk bericht niet weergeven - > > - Tekst uit oorspronkelijk bericht weergeven - If I understand correctly I must create a reference to the Treeview object. Which doesn't mean I'm creating a new Treeview. I will still use the Treeview on the Explorer1 form. The examples you gave me create a new object: Dim currentState As New TreeViewState Dim currentState As TreeViewState = New TreeViewState Dim currentState As TreeViewState currentState = New TreeViewState Is that creating the reference I need? Also what would the Sub New() look like? Marco Co wrote:
Show quoteHide quote > Jack, http://msdn.microsoft.com/en-us/library/2x7h1hfk.aspx> > If I understand correctly I must create a reference to the > Treeview object. Which doesn't mean I'm creating a new Treeview. > I will still use the Treeview on the Explorer1 form. > > The examples you gave me create a new object: > > Dim currentState As New TreeViewState > Dim currentState As TreeViewState = New TreeViewState > Dim currentState As TreeViewState > currentState = New TreeViewState > > Is that creating the reference I need? > Also what would the Sub New() look like? > > Marco Armin On Mon, 25 May 2009 23:59:35 -0700 (PDT), Co <vonclausow***@gmail.com>
wrote: Show quoteHide quote >On 26 mei, 05:27, Jack Jackson <jjackson-***@cinnovations.net> wrote: That creates a new instance of TreeViewState. I guess I don't know>> On Mon, 25 May 2009 08:44:19 -0700 (PDT), Co <vonclausow***@gmail.com> >> wrote: >> >> >> >> >> >> >On 25 mei, 17:10, Jack Jackson <jjackson-***@cinnovations.net> wrote: >> >> On Mon, 25 May 2009 06:07:19 -0700 (PDT), Co <vonclausow***@gmail.com> >> >> wrote: >> >> >> >Hi All, >> >> >> >As a follow up of my previous question concerning calling functions >> >> >from another form I created this: >> >> >> >Public Class TreeViewState >> >> > Inherits Explorer1 >> >> > Private tt As New Dictionary(Of String, Boolean) >> >> >> > Public Sub RestoreTreeViewExpandedState() >> >> >> > Dim i As Integer >> >> > For i = 0 To TreeView.Nodes.Count - 1 >> >> >> > If tt.ContainsKey(TreeView.Nodes(i).Name) Then >> >> >> > If tt(TreeView.Nodes(i).Name) Then >> >> > TreeView.Nodes(i).Expand() >> >> > Else >> >> > TreeView.Nodes(i).Collapse() >> >> > End If >> >> > End If >> >> > Next >> >> > End Sub >> >> >> > Public Function SaveTreeState() >> >> >> > Dim i As Integer >> >> >> > For i = 0 To TreeView.Nodes.Count - 1 >> >> >> > If TreeView.Nodes(i).Nodes.Count > 0 Then >> >> > tt.Add(TreeView.Nodes(i).Name, TreeView.Nodes >> >> >(i).IsExpanded) >> >> > End If >> >> > Next >> >> >> > Return tt >> >> > End Function >> >> >> >End Class >> >> >> >This class will save the status of the treeview on form Explorer1. >> >> >I want to call the functions in this class from another form, >> >> >frmZoeken: >> >> >> >Dim currentState As TreeViewState >> >> >currentState.SaveTreeState() >> >> >SaveQueryInTreeview() >> >> >currentUser.RestoreTreeViewExpandedState() >> >> >> >I get an error when I try this obect reference not set to an instance >> >> >of an object >> >> >> >Marco. >> >> >> This is exactly the same problem you had yesterday or the day before. >> >> You are creating a variable (currentState) but not setting it to an >> >> object. Also, again you are telling us about an error but not telling >> >> us on which line the error occurs. >> >> >> Any of these will create a new object: >> >> Dim currentState As New TreeViewState >> >> >> Dim currentState As TreeViewState = New TreeViewState >> >> >> Dim currentState As TreeViewState >> >> currentState = New TreeViewState >> >> >> I don't like the fact that in this class you keep referring to an >> >> object called "TreeView". It would be better if you added a parameter >> >> to the New() of the TreeViewState class which is a reference to the >> >> TreeView the class is to operate on. That way you could use this >> >> class for any TreeView object. >> >> >Jack, >> >> >could you please show me how this Sub New() >> >would look like and tell me how I can create a New object >> >for a Treeview which is shown on my Explorer1 form? >> >> >You know what I don't understand is why you just can't call >> >something which is already there. Why creating a new instance? >> >I mean when I create a new instance I will use that newly created >> >object >> >instead of the one already on Explorer1 form. >> >> >Marco >> >> If you already have an object, you use that object, you don't create a >> new one. I never said you should create a New Treeview. As I showed >> you in my previous message, the problem was with TreeViewState. You >> never initialized the currentState variable. You either need to set >> it to an existing TreeViewState object, or you need to create a new >> one.- Tekst uit oorspronkelijk bericht niet weergeven - >> >> - Tekst uit oorspronkelijk bericht weergeven - > >Jack, > >If I understand correctly I must create a reference to the >Treeview object. Which doesn't mean I'm creating a new Treeview. >I will still use the Treeview on the Explorer1 form. > >The examples you gave me create a new object: > >Dim currentState As New TreeViewState >Dim currentState As TreeViewState = New TreeViewState >Dim currentState As TreeViewState >currentState = New TreeViewState > >Is that creating the reference I need? >Also what would the Sub New() look like? > >Marco what TreeViewState is. I thought it was a stand-alone class, but now I guess maybe it is not. I see that it inherits from Explorer1, which apparently is a form. I don't understand why you would want to do that. I think you need to do some serious studying on how to use classes and objects. On 26 mei, 15:58, Jack Jackson <jjackson-***@cinnovations.net> wrote:
Show quoteHide quote > On Mon, 25 May 2009 23:59:35 -0700 (PDT), Co <vonclausow***@gmail.com> Thank you> wrote: > > > > >On 26 mei, 05:27, Jack Jackson <jjackson-***@cinnovations.net> wrote: > >> On Mon, 25 May 2009 08:44:19 -0700 (PDT), Co <vonclausow***@gmail.com> > >> wrote: > > >> >On 25 mei, 17:10, Jack Jackson <jjackson-***@cinnovations.net> wrote: > >> >> On Mon, 25 May 2009 06:07:19 -0700 (PDT), Co <vonclausow***@gmail.com> > >> >> wrote: > > >> >> >Hi All, > > >> >> >As a follow up of my previous question concerning calling functions > >> >> >from another form I created this: > > >> >> >Public Class TreeViewState > >> >> > Inherits Explorer1 > >> >> > Private tt As New Dictionary(Of String, Boolean) > > >> >> > Public Sub RestoreTreeViewExpandedState() > > >> >> > Dim i As Integer > >> >> > For i = 0 To TreeView.Nodes.Count - 1 > > >> >> > If tt.ContainsKey(TreeView.Nodes(i).Name) Then > > >> >> > If tt(TreeView.Nodes(i).Name) Then > >> >> > TreeView.Nodes(i).Expand() > >> >> > Else > >> >> > TreeView.Nodes(i).Collapse() > >> >> > End If > >> >> > End If > >> >> > Next > >> >> > End Sub > > >> >> > Public Function SaveTreeState() > > >> >> > Dim i As Integer > > >> >> > For i = 0 To TreeView.Nodes.Count - 1 > > >> >> > If TreeView.Nodes(i).Nodes.Count > 0 Then > >> >> > tt.Add(TreeView.Nodes(i).Name, TreeView.Nodes > >> >> >(i).IsExpanded) > >> >> > End If > >> >> > Next > > >> >> > Return tt > >> >> > End Function > > >> >> >End Class > > >> >> >This class will save the status of the treeview on form Explorer1. > >> >> >I want to call the functions in this class from another form, > >> >> >frmZoeken: > > >> >> >Dim currentState As TreeViewState > >> >> >currentState.SaveTreeState() > >> >> >SaveQueryInTreeview() > >> >> >currentUser.RestoreTreeViewExpandedState() > > >> >> >I get an error when I try this obect reference not set to an instance > >> >> >of an object > > >> >> >Marco. > > >> >> This is exactly the same problem you had yesterday or the day before. > >> >> You are creating a variable (currentState) but not setting it to an > >> >> object. Also, again you are telling us about an error but not telling > >> >> us on which line the error occurs. > > >> >> Any of these will create a new object: > >> >> Dim currentState As New TreeViewState > > >> >> Dim currentState As TreeViewState = New TreeViewState > > >> >> Dim currentState As TreeViewState > >> >> currentState = New TreeViewState > > >> >> I don't like the fact that in this class you keep referring to an > >> >> object called "TreeView". It would be better if you added a parameter > >> >> to the New() of the TreeViewState class which is a reference to the > >> >> TreeView the class is to operate on. That way you could use this > >> >> class for any TreeView object. > > >> >Jack, > > >> >could you please show me how this Sub New() > >> >would look like and tell me how I can create a New object > >> >for a Treeview which is shown on my Explorer1 form? > > >> >You know what I don't understand is why you just can't call > >> >something which is already there. Why creating a new instance? > >> >I mean when I create a new instance I will use that newly created > >> >object > >> >instead of the one already on Explorer1 form. > > >> >Marco > > >> If you already have an object, you use that object, you don't create a > >> new one. I never said you should create a New Treeview. As I showed > >> you in my previous message, the problem was with TreeViewState. You > >> never initialized the currentState variable. You either need to set > >> it to an existing TreeViewState object, or you need to create a new > >> one.- Tekst uit oorspronkelijk bericht niet weergeven - > > >> - Tekst uit oorspronkelijk bericht weergeven - > > >Jack, > > >If I understand correctly I must create a reference to the > >Treeview object. Which doesn't mean I'm creating a new Treeview. > >I will still use the Treeview on the Explorer1 form. > > >The examples you gave me create a new object: > > >Dim currentState As New TreeViewState > >Dim currentState As TreeViewState = New TreeViewState > >Dim currentState As TreeViewState > >currentState = New TreeViewState > > >Is that creating the reference I need? > >Also what would the Sub New() look like? > > >Marco > > That creates a new instance of TreeViewState. I guess I don't know > what TreeViewState is. I thought it was a stand-alone class, but now > I guess maybe it is not. I see that it inherits from Explorer1, which > apparently is a form. I don't understand why you would want to do > that. > > I think you need to do some serious studying on how to use classes and > objects. 
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