Control Arduino with C#

Here you can find the hardware code of my current project:
http://www.dfrobot.com/wiki/index.php/Relay_Shield_for_Arduino_V2.1_(SKU:DFR0144)

I need to write c# code for access the arduino hardware kit.

I was written many code but its not connected.

Please help me how to use c# code to connect my hardware.

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you tell the arduino what commands to expect and you send them to it in C#, read the response if any is required

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