mobile

 server---

using System.Web.Services;
using System.Text.RegularExpressions;

public string NumberValidator(string number)
        {
            Regex regex = new Regex(@"^[789]\d{9}$");

            Match match = regex.Match(number);

            if (match.Success)
                return number + " is Valid Mobile Number";
            else
                return number + " is Invalid Mobile Number";
        }


client---

          String mobile = TextBox1.Text;
            ServiceReference1.WebService1SoapClient obj = new ServiceReference1.WebService1SoapClient();
            String msg = obj.NumberValidator(mobile);
            Label2.Text = msg;