using System;

 using System.Collections.Generic;

 using System.ComponentModel;

 using System.Data;

 using System.Drawing;

 using System.Linq;

 using System.Text;

 using System.Threading.Tasks;

 using System.Windows.Forms;

 using System.ServiceModel;

 using System.ServiceModel.Channels;

 namespace SharpDisplayClient

 {

     public partial class MainForm : Form

     {

         Client iClient;

         Callback iCallback;

         public MainForm()

         {

             InitializeComponent();

         }

         private void buttonSetText_Click(object sender, EventArgs e)

         {

             //iClient.SetText(0,"Top");

             //iClient.SetText(1, "Bottom");

             iClient.SetTexts(new string[] { "Top", "Bottom" });

         }

         private void MainForm_Load(object sender, EventArgs e)

         {

             iCallback = new Callback();

             //Instance context is then managed by our client class

             InstanceContext instanceContext = new InstanceContext(iCallback);

             iClient = new Client(instanceContext);

             //Connect using unique name

             string name = DateTime.Now.ToString("MM/dd/yyyy hh:mm:ss.fff tt");

             iClient.Connect(name);

             Text = Text + ": " + name;

         }

         public void CloseConnection()

         {

             if (IsClientReady())

             {

                 //iClient.Disconnect();

                 iClient.Close();

             }

             iClient = null;

             iCallback = null;

         }

         private void MainForm_FormClosing(object sender, FormClosingEventArgs e)

         {

             if (IsClientReady()) //Could catch exception instead

             {

                 iClient.Disconnect();

             }

             CloseConnection();

         }

         public bool IsClientReady()

         {

             return (iClient != null && iClient.State == CommunicationState.Opened);

         }

     }

 }