private void confirm_Click(object sender, EventArgs e)
 {
     if (mng.EditPassword(currentpassword.Text, newpassword.Text, confirmpassword.Text) == 2)
     {
         FileStream      file = File.Create("Uni");
         BinaryFormatter bf   = new BinaryFormatter();
         bf.Serialize(file, Universal.instance);
         file.Close();
         ManagerPanel managerpanel = new ManagerPanel(id);
         managerpanel.Show();
         this.Hide();
     }
     else if (mng.EditPassword(currentpassword.Text, newpassword.Text, confirmpassword.Text) == 1)
     {
         errorProvider2.SetError(confirmpassword, "تکرار رمز عبور صحیح نیست");
     }
     else
     {
         errorProvider1.SetError(currentpassword, "رمز عبور اشتباه است");
     }
 }