C#

using System;
using System.Data;
using System.Web;
using System.Collections;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.ComponentModel;
using VDSDKLib;

namespace PSWD_Server
{
    /// <summary>
    /// Summary description for PSWD_WebService
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    
    public class PSWD_WebService : WebService
    {        
        [WebMethod]
        public string HelloWorld()
        {
            return "Hello World";
        }
        [WebMethod]
        public string Help()
        {
            return "Help";
        }
    }
}

// Windows Application

PSWD_WebService WebSer = new PSWD_WebService();
TextBox1.Text = WebSer.HelloWorld();  // HelloWorld() here acceped and returns good.
TextBox1.Text = WebSer.Help();        // Help() here is not acceped and not readed
private void UnmountDisk()
{
   CreateBtn.Enabled = true;
   DestroyBtn.Enabled = false;
}