protected void Button1_Click(object sender, EventArgs e) { ServiceReference1.Service1Client ob = new ServiceReference1.Service1Client(); //creating the service reference object for mapping the Verification service string xmltextbox = TextBox1.Text; //textbox holding the XML url string xsdtextbox = TextBox2.Text; //textbox holding the XSD url if(xmltextbox == "" || xsdtextbox =="") { Label3.Text = "Please enter data"; //label to display the value when no url is entered Label3.Visible = true; } else { Label3.Text = ob.verify(xmltextbox, xsdtextbox); //label to display the validation value Label3.Visible = true; } }