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    CONSOLE APPLICATION : CSSocketServer Project Overview
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Use:

Sockets are an application programming interface (API) in an operating system,
used for in inter-process communication. Sockets constitute a mechanism for 
delivering incoming data packets to the appropriate application process or 
thread, based on a combination of local and remote IP addresses and port 
numbers. Each socket is mapped by the operational system to a communicating
application process or thread.


.NET supplies a Socket class which implements the Berkeley sockets interface.
It provides a rich set of methods and properties for network communications. 
The Socket class allows you to perform both synchronous and asynchronous data
transfer using any of the communication protocols listed in the ProtocolType
enumeration. It supplies the following types of socket:

Stream: Supports reliable, two-way, connection-based byte streams without 
the duplication of data and without preservation of boundaries.

Dgram:Supports datagrams, which are connectionless, unreliable messages of
a fixed (typically small) maximum length. 

Raw: Supports access to the underlying transport protocol.Using the 
SocketTypeRaw, you can communicate using protocols like Internet Control 
Message Protocol (Icmp) and Internet Group Management Protocol (Igmp). 

Rdm: Supports connectionless, message-oriented, reliably delivered messages, 
and preserves message boundaries in data. 

Seqpacket:Provides connection-oriented and reliable two-way transfer of 
ordered byte streams across a network.

Unknown:Specifies an unknown Socket type.


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Project Relation:

CSSocketClient <--> CSSocketServer
CSSocketClient is the client process to communicate the server process
via the socket.


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Code Logic:

1. Create a socket to listen the incoming TCP connection.

2. After get the client connection,asynchronously receive the data and listen
the TCP connection again.

3. Finishing receiving data, send the response to client process.

4. If user inputs the word quit to exit the program


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References:

Chapter4: Using Sockets of Professional .NET Network Prgromming
http://www.amazon.com/Professional-Network-Programming-Srinivasa-Sivakumar/dp/1861007353

Socket Class
http://msdn.microsoft.com/en-us/library/system.net.sockets.socket.aspx

Asynchronous Server Socket Example
http://msdn.microsoft.com/en-us/library/fx6588te.aspx


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