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How to communicate between forms

Posted on 2002-03-30
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Last Modified: 2010-05-02
How do you communicate between forms in VB.NET? In VB 6 I am used to typing for example frmMySecondForm.property. How is this accomplished in VB.NET?
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Question by:pcaviness
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4 Comments
 
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Expert Comment

by:AzraSound
ID: 6907948
You should create instances of the forms using variables, since they are, after all, just classes that should be instantiated that way anyways, e.g.,


Dim f As frmMySecondForm = New frmMySecondForm()
f.Show()
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Author Comment

by:pcaviness
ID: 6908166
I know about creating new instances of the forms but I want to be able to change elements on existing forms from other forms. Any suggestions?
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Accepted Solution

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carloss earned 225 total points
ID: 6908395
Because as AzraSound mentioned above, a form is just another object.  You can create public methods on the form that can be called from other sections in your code as you would any other method of an object.  Such as

Form1:

Public Sub LockTextBox()

TextBox1.Locked = True

End Sub

Any other place in code:

Form1.LockTextBox

You can also define a public object and set its instance equal to the element you want such as:

Form1:

Public MyTextBox as TextBox

Public Sub Form1_OnLoad()

Set MyTextBox = TextBox1

End Sub

Any other place in code:

Form1.MyTextBox.Text = "Set from somewhere else"
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Author Comment

by:pcaviness
ID: 6909229
I had to figure out a few things to get it to work such as making the objects shared. But it worked. Thanks
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