hi,
does textchange control for the textbox executes for every change in every character or for the full text?

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For every keystroke. Add this event handler and you will see. The titlebar will be updated every time you press a key.

Private Sub TextBox1_TextChanged(sender As System.Object, e As System.EventArgs) Handles TextBox1.TextChanged
    Me.Text = TextBox1.Text
End Sub
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For every keystroke. Add this event handler and you will see. The titlebar will be updated every time you press a key.

Private Sub TextBox1_TextChanged(sender As System.Object, e As System.EventArgs) Handles TextBox1.TextChanged
    Me.Text = TextBox1.Text
End Sub