private void forgetPasswordButton_Click(object sender, EventArgs e)
{
Enabled = false;
fpf = new ForgetPasswordForm();
fpf.FormClosed += new FormClosedEventHandler(forgetPasswordForm_Closed);
fpf.ShowDialog();
}
private void forgetPasswordForm_Closed(object sender, EventArgs e)
{
fpf = null;
Clipboard.Clear();
Enabled = true;
}