private void OKButton_Click(object sender, EventArgs e)
        {
            if (NPasswordTextBox1.Text != NPasswordTextBox2.Text)
            {
                MessageBox ib = new MessageBox(10);
                ib.ShowDialog();
                ib.Dispose();
                NPasswordTextBox1.Focus();
                return;
            }

            var v = ClassBackEnd.ChangePassword(OPasswordTextBox.Text, NPasswordTextBox1.Text);

            if (v == 0)
            {
                MessageBox infoBox = new MessageBox(9);
                infoBox.ShowDialog();
                infoBox.Dispose();
                return;
            }
            else if (v == 1)
            {
                MessageBox infoBox = new MessageBox(3);
                infoBox.ShowDialog();
                infoBox.Dispose();
                Close();
            }
            else if (v == 2)
            {
                MessageBox infoBox = new MessageBox(15);
                infoBox.ShowDialog();
                infoBox.Dispose();
                return;
            }
        }
 private void NPasswordCueText1_Click(object sender, EventArgs e)
 {
     if (NPasswordTextBox1.Text == "")
     {
         NPasswordCueText1.Hide();
         NPasswordTextBox1.Focus();
     }
 }