Multiple Forms

Hello All,

Kinda new at this!

How do I reference a form that it already open?

This is what Im doing:

I have form3 open, a button on form3 opens form4.

Then the data I enter in a textbox on form4 I would like it to appear on form3 which is currently open.

I tried Dim form as form3
but I get a NullReference Exception!


Any help would be Appreciated!

ok , in Form3 ( to load Form4 ) do this :

VB Code:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim frm4 As New Form4()
        AddOwnedForm(frm4) '/// make form4 owned by form3.
        frm4.Show()
    End Sub

in Form4 ( to send some text back to Form3 ) do this :

VB Code:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim frm3 As Form3 = Me.Owner
        frm3.TextBox1.Text = "some text from form4!"
    End Sub

to make it easier i've thrown an example together.