C# Server Socket program

The C# Socket Programming has two sections.

1. C# Server Socket Program

Server Socket Program

The Server Socket Program here is a C# Console based Application . This program act as a Server and listening to clients request . Here we assign a Port No. 8888 for the Server Socket , it is an instance of the C# Class TcpListener , and call its start() method.

TcpListener serverSocket = new TcpListener(8888); serverSocket.Start();

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The next step is to create an infinite loop for monitoring the request from Client's side . When the Server Socket accept a request from the Client side, it reads the data from NetworkStream and also it write the response to NetworkStream .

From the following C# program you can understand how to create a Socket Server in C# . Create a new C# Console Application Project and put the following source code into the project.

Full Source C#

How to run this program ?

The C# Socket Programming has two sections.

1. C# Server Socket Program

2. C# Client Socket Program

When you finish coding and build the Server and Client program , First you have to start C# Server Socket Program from DOS prompt , then you will get a message " Server Started " in your DOS screen, where the server program is running .

Next step is to start C# Client Socket Program in the same computer or other computers on the same network . When you start the client program , it will establish a connection to the Server and get a message in client screen " Client Started " , at the same time you can see a message in the Server screen " Accept connection from client " .

Now your C# Server Socket Program and C# Client Socket Program is get connected and communicated . If you want to communicate the Server and Client again , click the button in the client program , then you can see new messages in the Server and Client programs displayed.

Full Source C#

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Net.Sockets; namespace ConsoleApplication1 { class Program { static void Main(string[] args) { TcpListener serverSocket = new TcpListener(8888); int requestCount = 0; TcpClient clientSocket = default(TcpClient); serverSocket.Start(); Console.WriteLine(" >> Server Started"); clientSocket = serverSocket.AcceptTcpClient(); Console.WriteLine(" >> Accept connection from client"); requestCount = 0; while ((true)) { try { requestCount = requestCount + 1; NetworkStream networkStream = clientSocket.GetStream(); byte[] bytesFrom = new byte[10025]; networkStream.Read(bytesFrom, 0, (int)clientSocket.ReceiveBufferSize); string dataFromClient = System.Text.Encoding.ASCII.GetString(bytesFrom); dataFromClient = dataFromClient.Substring(0, dataFromClient.IndexOf("$")); Console.WriteLine(" >> Data from client - " + dataFromClient); string serverResponse = "Last Message from client" + dataFromClient; Byte[] sendBytes = Encoding.ASCII.GetBytes(serverResponse); networkStream.Write(sendBytes, 0, sendBytes.Length); networkStream.Flush(); Console.WriteLine(" >> " + serverResponse); } catch (Exception ex) { Console.WriteLine(ex.ToString()); } } clientSocket.Close(); serverSocket.Stop(); Console.WriteLine(" >> exit"); Console.ReadLine(); } } }

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