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Chatting Application Using DotNet

, 5 Jul 2007
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Chatting Application Using VB.Net (ConCurrent Server)

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Screenshot - Server_Form1.jpg

Screenshot - Client_after_Conn.jpg


Simple Chatting Application Using Socket Programming in VB.Net . This Application use TCP Protocol for Communication. So it is Connection Oriented and reliable Service.........


Mainly Background is Socket Programming in VB.NET which use System.Net.Sockets NameSpace...

Client Socket::: TcpClient Class

Server Socket:: TcpListner Class

Socket is Combination of IP_Address and PortNo.. When we create Socket we have to give IP , Port No and Protocol..

Here DotNet give TcpClient Class which is by default use TCP Protocol.. we have to just provide IP And PortNo..

Same way For TcpListner Class also...............

Using the code

Connect Sub Will send Connection Request to server on given ip

after Connection Receive function is started using thread.. because receive function will go in infinite loop so we have to start receive funtion using Thread.otherwise your mainProcess will goes in infinite loop..

// Public Sub Connect()
            ipHostinfo = Dns.Resolve(Txtserver.Text)
            ipAdd = ipHostinfo.AddressList(0)
            remoteEP = New IPEndPoint(ipAdd, 11000)
            th = New System.Threading.Thread(AddressOf Receive)
            i = 1
            MessageBox.Show("Client Connected With Server->" + Txtserver.Text)
        Catch ex As Exception

        End Try
    End Sub

if we use Multi threading architecture we get 1 main Problem Called: Cross Thread Problem

Solve this problem using Delegate Funtion..Here is Solution

 If Me.List.InvokeRequired Then
            Dim d As New SetDisplay(AddressOf Proccessdata)
            Me.Invoke(d, New Object() {str})
Public Sub Receive()
        Dim bytes(100000) As Byte
        Dim bytesRec As Integer
   A:      While True
            bytes = New Byte(100000) {}
            bytesRec = sender.Receive(bytes)
            If bytesRec > 0 Then
                Data = Encoding.ASCII.GetString(bytes, 0, bytesRec)
                Exit While
            End If
           End While
        GoTo A
End Sub
            msg = Encoding.ASCII.GetBytes(Txtmsg.Text)
            Txtmsg.Text = ""
        Catch ex As Exception
        End Try

Points of Interest

Screenshot - Cd_Drive.jpg

This is part of Client Screen.. one intresting point that we can control server Cd Drive From Client Form...

You can Open Notepad , PainBrush ,Calculator On server Machine From Client Screen....

You Can Lock and Release Mouse of Client Pc From the Server....

You Can ShutDown and Restart client Computer From the Server.....

You Can Capture the Photo of Client Screen From the Server......


Keep a running update of any changes or improvements you've made here.


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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About the Author

Web Developer
India India
No Biography provided

Comments and Discussions

Questionniccceeeeeeeeee PinmemberZiZoU3276-Feb-14 5:14 
QuestionMulti User PinmemberPeyman Mohammadi13-Feb-13 12:10 
GeneralMy vote of 1 PinmemberBillaBong1-Mar-11 13:05 
GeneralMy vote of 4 PinmemberParsagachkar8-Jan-11 22:33 
QuestionHow should i Get servers IP? PinmemberParsagachkar8-Jan-11 22:31 
QuestionHi PinmemberMember 465630230-Mar-09 3:47 
Generalthankes Pinmembergoldman141511-Jan-09 8:44 
Questiondoubt for declaration? Pinmembergowthamforever24-Dec-08 2:00 
Questionhow to chat the two system,but there is located in different location PinmemberPandian60212-Jul-08 1:00 
Questionwow Pinmemberkasif@kasif.org5-Aug-07 3:14 
GeneralGreat Article! PinmemberRyanPotter3-Aug-07 22:47 

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