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This should be simple but ... I have this event handler on a textbox to ignore right mouse clicks. When it executes I get InvalidCastException on the 3rd line.
private void txtUserName_MouseDown(object sender, MouseEventArgs e) {
if (e.Button == System.Windows.Forms.MouseButtons.Right) {
HandledMouseEventArgs eh = (HandledMouseEventArgs)e;
eh.Handled = true;
}
}
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