Simple VB control question

[mookie0001]

Hi everyone,

I know that there is probably a very easy way to do this, but I have yet to figure it out. Here is the basic scenario:

Form1 contains Label1
Form1 creates an instance of Form2

Form2 contains Button1
Form2.Button1.onClick needs to set Form1.Label1.Text = "something" (without creating a new instance of Form1 because I need to keep all other values as-is).

Your help is appreciated. Thanks!

-Chris

[MartinLiss]

You pretty much have the answer already. In the Click event of the command button on Form2 add the following

Form1.Label1.Caption = "something"

[mookie0001]

That was one of the first things that I tried....the error is:

Reference to a non-shared member requires an object reference.

[MartinLiss]

I have never seen or heard of that error. I've attached a little project. What are you doing that's different?

[mookie0001]

I checked out your project and I think I discovered our differences. My project is a VB.NET project. I'm not sure if that is the cause of the differences or not (sorry for not making that clear earlier).

-Chris

[mookie0001]

Here is my code:

Public Class Form1
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim form2 As New Form2()
        form2.Show()
    End Sub
End Class
 
 
Public Class Form2
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Form1.Label1.caption = "something" ' this does not work
    End Sub
End Class

[MartinLiss]

Sorry, but I've never done .Net.

[Wokawidget]

In some ways .NET is VERY different to VB 6

Woka

[mookie0001]

Hmm....maybe this is not as easy to do as I thought. Your help is appreciated though Martin. Does anyone else have any suggestions?

[Wokawidget]

You could have the following in Form2:

Private mfrmForm1 As Form1
 
Public Property Set Form1(Byval pfrmValue as Form1)
   Set mfrmForm1 = pfrmValue
End Property

When you Load form2 from form1 just set Form1 = Me
Then when you click the button just access the load varible...

[mookie0001]

Wokawidget, is your code in VB6? .NET gave me an error about it no longer being supported. I tried to create something equivalent and it gave me null object errors when trying to set values in the form. I think it has something to do with how .NET uses "instances" of objects (i.e. I wasn't working with the actual form1, only an instance of it.)


This is really frustrating, something that seems so easy and trivial is turning out to be quite a pain. Anyone else have any ideas?

[BuggyProgrammer]

you should be posting .NET questions in the .NET section. you'll get your answer there quicker than here. Maybe martinliss could move the thread?

[mookie0001]

Would that be ok to move the thread, MartinLiss? Or should I just repost the question? Thanks.

-Chris

[MartinLiss]

Moved from General VB.

[mookie0001]

I found the solution to my problem. In case anyone is interested:

Public Class Form1
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim f2 As New Form2()
        f2.Create(Me)
    End Sub
End Class
 
Public Class Form2
    Private m_fParent As Form1
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        m_fParent.Label1.Text = "something"
    End Sub
 
    Sub Create(ByVal fParent As Form1)
        m_fParent = fParent
        Me.Show()
    End Sub
End Class

[Pirate]

Search the VB.NET Forum for passing values across forms or something like that . There are couple of ways , one of them is to override the form's constructor passing a form as para . The other way , is to define global form variable . I'm not sure if you can do it with delegates . Sorry I can't think of that right now .

[MartinLiss]

Please edit the original post and add "[Resolved]" (or similar).

[robbedaya]

You could just have Searched in the " Windows Form Designer generated code " of your form1 for the declarationn of your label and, you could add the word "Shared" in the beginning of the declaration. This is what caused this error "Reference to a non-shared member requires an object reference."