fundemental of socket programming in C#

1. Socket Programming
with C#

2. Windows Socket
• Windows Sockets 2 (Winsock) enables programmers to create advanced
Internet, intranet, and other network-capable applications to transmit
application data across the wire, independent of the network protocol being
used.

3. Server vs Client
• Server: Listen on a port
• Client: Connect to server
If the server is not “Listening” then client can not connect to it.

4. Server steps
Create a socket.
Bind the socket.
Listen on the socket for a client.
Accept a connection from a client.
Receive and send data.
Disconnect.

5. Client steps
Create a socket.
Connect to the server.
Send and receive data.
Disconnect.

6. C# socket class
class TcpListener : Listens for connections from TCP network clients.
class TcpClient : Provides client connections for TCP network services.
class UdpClient : Provides User Datagram Protocol (UDP) network services.
NetworkStream : Provides the underlying stream of data for network access.
SocketException The exception that is thrown when a socket error occurs.

7. Synchronous and Asynchronous
Many applications call methods asynchronously because it enables the
application to continue doing useful work while the method call runs.
An asynchronous client socket does not suspend the application while waiting
for network operations to complete.
Synchronous call return immediately without waiting for the method to
finished.