To get going first go here :
Next read the steps to install it :
1. Installing the Mono Framework
After installation the Mono Framework is located in :
2. Testing the DotNet Framework
Once installed you can test it using the Hello Mono World Example :
First copy the Hello.cs to the Root folder (keep in mind that File Names are CASE SENSITIVE in Linux)
You can as well build GUI applications, but run it make sure you have the Xserver running first.
Otherwise you will see this error appearing.
So now we know there is a DotNet Framework installed on Linux, we can start scripting