private void confirm_bt_Click(object sender, EventArgs e)
 {
     try
     {
         if (user.Password == currentPassword_tb.Text)
         {
             cred          = new CredentialService();
             user.Password = newPassword_tb.Text;
             int r = cred.ChangePassword(user);
             if (r > 0)
             {
                 MessageBox.Show("Password Changed");
                 new Home(user).Show();
                 this.Hide();
             }
         }
     }
     catch (Exception ex) { }
 }