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Copy data from a child form within a MDI

Posted on 2009-03-30
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Last Modified: 2012-05-06
I have two forms in a parent MDI. I want to copy the value displayed in Textbox1 of Form1 to Textbox1 of Form2.
By not using MDI, the code Me.Textbox1.Text=Form1.Textbox1.Text worked fine. But when I run the forms using MDI, it did not work.
How do I refer Form1 with a MDI form.

Thanks.

Ed
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Question by:MINDSUPERB
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Mike Tomlinson earned 2000 total points
ID: 24020667
"By not using MDI, the code Me.Textbox1.Text=Form1.Textbox1.Text worked fine."

This worked because you were accessing the "default instance" of Form1...most likely it was the startup form in that test?

If you will only ever have ONE instance of each MdiChild form, then use the default instances for each child form.  If you need multiple instances of a child then this option is out.  To use the default instance, just use the NAME of the form, WITHOUT ever using the "new" keyword:

    ' ...in the MdiParent...
    Form1.MidParent = Me ' <-- the "new" keyword was NOT used
    Form1.Show()

    ' ...then from ANYWHERE...you can access the other child forms by NAME:
    Me.Textbox1.Text=Form1.Textbox1.Text

Otherwise, you could iterate the MdiChildren() collection until you find a match:

    ' ...from within an MdiChild:
    For Each frm As Form In Me.MdiParent.MdiChildren
        If Typeof frm Is Form1 Then
            Dim f1 As Form1 = DirectCast(frm, Form1)
            Me.TextBox1.Text = f1.TextBox1.Text
            Exit For
        End If
    Next

But this has limited use if you have multiple instances since you would know which one is the one you wanted.
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by:MINDSUPERB
ID: 31564350
Thanks. You give me both: a solution of my problem and a best learning.
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