private void TxtCHN_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.A && e.Modifiers == Keys.Control)
{
TxtCHN.SelectAll();
}
}
private void TxtCHN_DoubleClick(object sender, EventArgs e)
{
TxtCHN.SelectAll();
}
private void TxtCHN_Enter(object sender, EventArgs e)
{
TxtCHN.SelectAll();
}
