webservice异步调用

已经建立webservice:http:// webs异步调用.servervice1.asmx

[STAThread]
        static void Main() 
        {
            Application.Run(new Form1());
        }

        private void Form1_Load(object sender, System.EventArgs e)
        {
        

        
        }
        public static void WebCallback(IAsyncResult ar)
        {
            
            hlk.Service1 hlks=(hlk.Service1)ar.AsyncState;
            
            MessageBox.Show("okok");
            bytePic=hlks.EndGetImage(ar);
            
                
        }

        


        private void button1_Click(object sender, System.EventArgs e)
        {
            webS异步调用.hlk.Service1 webS=new webS异步调用.hlk.Service1();
            path=this.textBox1.Text;

            AsyncCallback cb=new AsyncCallback(Form1.WebCallback);
                    
            IAsyncResult ar = webS.BeginGetImage(path, null, null);

            // Wait for the asynchronous operation to complete.
            ar.AsyncWaitHandle.WaitOne();

            // Get the completed results.
            byte[] results;     
            results = webS.EndGetImage(ar);
          
            //Output the results.
            System.IO.MemoryStream ms=new System.IO.MemoryStream(results);
            this.pictureBox1.Image=Image.FromStream(ms);
        
        }