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

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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