public class MySoapHeader : System.Web.Services.Protocols.SoapHeader

    {

        private string userID = string.Empty;

        private string userPW = string.Empty;

        public string UserId

        {

            get { return userID; }

            set { userID = value; }

        }

        public string UserPW

        {

            get { return userPW; }

            set { userPW = value; }

        }

        public MySoapHeader()

        { }

        public MySoapHeader(string name, string password)

        {

            userID = name;

            userPW = password;

        }

        private bool IsValid(string nUserId, string nPassWord, out string nMsg)

        {

            nMsg = "";

            try

            {

                if (nUserId == "admin" && nPassWord == "admin")

                {

                    return true;

                }

                else

                {

                    nMsg = "对不起,你无权调用Web服务";

                    return false;

                }

            }

            catch

            {

                nMsg = "对不起,你无权调用Web服务";

                return false;

            }

        }

        public bool IsValid(out string nMsg)

        {

            return IsValid(userID, userPW, out nMsg);

        }

    }

    [WebService(Namespace = "http://tempuri.org/")]

    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

    [System.ComponentModel.ToolboxItem(false)]

    // 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。

    // [System.Web.Script.Services.ScriptService]

    public class WebService1 : System.Web.Services.WebService

    {

        public MySoapHeader myheader = new MySoapHeader();

        [WebMethod]

        public string HelloWorld()

        {

            return "Hello World";

        }

        //该地方是调用SoapHeader地方，注意观察

        [SoapHeader("myheader")]

        [WebMethod(Description="Say Hello My World")]

        public string HelloWorld2()

        {

            string msg = "";

            if (!myheader.IsValid(out msg))

            {

                return msg;

            }

            return "Hello World";

        }

    }    

 static void Main(string[] args)

        {

            MyService.WebService1SoapClient cmlent = new MyService.WebService1SoapClient();

            MyService.MySoapHeader hro=new MyService.MySoapHeader ();

            hro.UserId="admin";

            hro.UserPW="admin";

            string rsult=cmlent.HelloWorld2(hro);

            Console.WriteLine(rsult);

            Console.ReadKey();

        }