Duplex Client Program

First We have to  develop a Duplex communication service  then now we have consume that service.so please following steps:

1. In a new website add service reference for creating Proxy.
2. Design the new form according to requirement sothat we pass inputs as well as outputs from wcf service.
3. Add a new class and implement callback interface for Getting or Posting results.

Write following Code in MyCall.cs

      using System;

      using System.Collections.Generic;

      using System.Linq;

      using System.Web;

      /// <summary>

      /// Summary description for MyClass

      /// </summary>

        public class MyClass : CourierTrackNamespace.ICourierTrackCallback

        {

            public MyClass()

            {

                       

            }

         public static string Info1;

         public void Result(string info)

         {

             Info1 = info;

          }

         }

                                  

Write following Code in Default.cs

           using System;

           using System.Collections.Generic;

           using System.Linq;

           using System.Web;

           using System.Web.UI;

           using System.Web.UI.WebControls;

          using System.ServiceModel;

          public partial class _Default : System.Web.UI.Page

          {

           protected void Page_Load(object sender, EventArgs e)

          {

           }

          protected void Timer1_Tick(object sender, EventArgs e)

         {

              lblres.Text = MyClass.Info1;

          }

           protected void btnOrder_Click(object sender, EventArgs e)

          {

           InstanceContext ic = new InstanceContext(new MyClass());

           CourierTrackNamespace.CourierTrackClient obj = new     CourierTrackNamespace.CourierTrackClient(ic);

           obj.PlaceOrder(int.Parse(txtinput.Text));

           Timer1.Enabled = true;

           }

         }

Write following Code in Default.aspx

• Here Some Points to Noted:

             Timer-interval=1000; and Enabled view=false;