private void button1_Click(object sender, EventArgs e) { localhost.Service1 ser = new localhost.Service1(); bool isvaliduser; bool isvaliduserpassed; ser.isValidUser(txtusername.Text, txtpassword.Text, out isvaliduser, out isvaliduserpassed); if (isvaliduser) { MessageBox.Show("Valid User"); } else { MessageBox.Show("InValid User"); } }