private void btnSum_Click(object sender, EventArgs e)
{
int x, y, sum = 0;
x = int.Parse(txtValue1.Text);
y = int.Parse(txtValue2.Text);
ServiceReference1.Service1SoapClient ws = new ServiceReference1.Service1SoapClient();
sum = ws.Add(x, y);
MessageBox.Show("Sum is = " + sum.ToString());
}