Simple VB control question

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

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

Form1.Label1.Caption = "something"

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

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

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

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

Here is my code:

VB 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

Sorry, but I've never done .Net.

In some ways .NET is VERY different to VB 6 :(

Woka

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

You could have the following in Form2:

VB Code:

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...

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?

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?

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

-Chris

Moved from General VB.

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

VB Code:

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

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 .

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

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."