TCP/IP Chat Application Using C#

��using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Net;

using Proshot.UtilityLib.CommonDialogs;



namespace ChatClient

{

    public partial class frmLogin : Form

    {

        private bool canClose;

        private Proshot.CommandClient.CMDClient client;

        public Proshot.CommandClient.CMDClient Client

        {

            get { return client; }

        }

        public frmLogin(IPAddress serverIP,int serverPort)

        {

            InitializeComponent();

            this.canClose = false;

            Control.CheckForIllegalCrossThreadCalls = false;

            this.client = new Proshot.CommandClient.CMDClient(serverIP , serverPort , "None");

            this.client.CommandReceived += new Proshot.CommandClient.CommandReceivedEventHandler(CommandReceived);

            this.client.ConnectingSuccessed += new Proshot.CommandClient.ConnectingSuccessedEventHandler(client_ConnectingSuccessed);

            this.client.ConnectingFailed += new Proshot.CommandClient.ConnectingFailedEventHandler(client_ConnectingFailed);

        }



        private void client_ConnectingFailed(object sender , EventArgs e)

        {

            frmPopup popup = new frmPopup(PopupSkins.SmallInfoSkin);

            popup.ShowPopup("Error" , "Server Is Not Accessible !" , 200 , 2000 , 2000);

            this.SetEnablity(true);

        }



        private void client_ConnectingSuccessed(object sender , EventArgs e)

        {

           this.client.SendCommand(new Proshot.CommandClient.Command(Proshot.CommandClient.CommandType.IsNameExists,this.client.IP,this.client.NetworkName));

        }



        void CommandReceived(object sender , Proshot.CommandClient.CommandEventArgs e)

        {

            if ( e.Command.CommandType == Proshot.CommandClient.CommandType.IsNameExists )

            {

                if ( e.Command.MetaData.ToLower() == "true" )

                {

                    frmPopup popup = new frmPopup(PopupSkins.SmallInfoSkin);

                    popup.ShowPopup("Error" , "The Username is already exists !" , 300 , 2000 , 2000);

                    this.client.Disconnect();

                    this.SetEnablity(true);

                }

                else

                {

                    this.canClose = true;

                    this.Close();

                }

            }

        }



        private void LoginToServer()

        {

            if ( this.txtUsetName.Text.Trim() == "" )

            {

                frmPopup popup = new frmPopup(PopupSkins.SmallInfoSkin);

                popup.ShowPopup("Error" , "Username is empty !" , 1000 , 2000 , 2000);

                this.SetEnablity(true);

            }

            else

            {

                this.client.NetworkName = this.txtUsetName.Text.Trim();

                this.client.ConnectToServer();

            }

        }

        private void btnEnter_Click(object sender , EventArgs e)

        {

            this.SetEnablity(false);

            this.LoginToServer();

        }

        private void SetEnablity(bool enable)

        {

            this.btnEnter.Enabled = enable;

            this.txtUsetName.Enabled = enable;

            this.btnExit.Enabled = enable;

        }



        private void btnExit_Click(object sender , EventArgs e)

        {

            this.canClose = true;

        }



        private void frmLogin_FormClosing(object sender , FormClosingEventArgs e)

        {

            if ( !this.canClose )

                e.Cancel = true;

            else

                this.client.CommandReceived -= new Proshot.CommandClient.CommandReceivedEventHandler(CommandReceived);

        }

    }

}