Create a WCF Service using wsHttpBinding and use in a Windows Forms application

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ServiceModel;
using System.IdentityModel.Selectors;

namespace TestService
{
    public class CustomValidator : UserNamePasswordValidator
    {
        public override void Validate(string userName, string password)
        {
            if (userName == null || password == null)
            {
                throw new ArgumentNullException();
            }

            if (!(userName == "a" && password == "a"))
            {
                throw new FaultException("Password or name is wrong");
            }
        }
    }
}