you can do this in the keydown event from your richtextbox (if you use the regular paste method)
private void richTextBox1_KeyDown(object sender, KeyEventArgs e)
{
if (e.Control == true && e.KeyCode == Keys.V)
{
e.Handled = true;
string st = Clipboard.GetText();
richTextBox1.Text = st;
}
}
hope this helps
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