login from using winform application

Question

below are my codes i want if you input wrong pasword it notify wrong password 

kindly help to rectify 

users = svcclient.Getuser(Convert.ToInt32(txtpassword.Text));

if (txtpassword.Text == users.user_pin)

{

//frontend.MDIfrontend front = new frontend.MDIfrontend();

//front.ShowDialog();

MessageBox.Show("Invalid Credentials!", "SoftByt info Tech");

}

else

{

frontend.MDIfrontend front = new frontend.MDIfrontend();

front.ShowDialog();

this.Dispose();

}