Control form from another form

[Gabriell]

How can we control another form from another form? I mean we control form A from from B. For example, if we click button OK on form A, the action will occur on form B.

[Mr.No]

Gabriell

You can refer to controls in formB from formA as follows:

' cmdUpdate event is in form A
  private sub cmdUpdate_Click()
       frmFormB.txtCustid.Text = 123
  End Sub

I personally don't like this technique of explicitly refering to a control on another form. You can alternatively add a public method in Form B and then invoke that method from form A

' Code in form B
Public sub UpdateCustomerID(byval custid as string)
   txtCustid.Text = custid
End sub
 
 
' code in form A
 
  ' cmdUpdate event is in form A
  private sub cmdUpdate_Click()
       frmFormB.UpdateCustomerID("123")
  End Sub

[Athley]

Send a instance of the first form to the second form when its opened. To do that rewrite the constructor of the second form to take a form as an argument. Something like this...

Dim baseForm as Form1
Public Sub New(frm as Form)
baseform = frm

InitializeComponent()

End Sub

Then you have a reference to the form.

[Pirate]

Originally posted by Gabriell
How can we control another form from another form? I mean we control form A from from B. For example, if we click button OK on form A, the action will occur on form B.

or you could declare instances of your forms in a module as follow:

'in a module 
dim frm1 as new form1 
dim frm2 as new form2 
 
'in a form :
frm2.button1.name ="blah"