Gajdusek clean

Added C# and MPI.NET

docs.it4i/software/csc.md

+# CSharp
+
+C# is available on the cluster. Activate C# by loading the Mono module:
+
+```console
+$ ml Mono
+```
+
+## Examples
+
+### Hello World
+
+Copy this code to new file hello.cs:
+
+```csc
+using System;
+
+class HelloWorld {
+  static void Main() {
+    Console.WriteLine("Hello world!!!");
+  }
+}
+```
+
+Compile the program and make *Windows executable*.
+
+```console
+$ mcs -out:hello.exe hello.cs
+```
+
+This command should not return any error status. You can try to remove one of the curly brackets to get error output:
+
+```console
+csc.cs(7,246): error CS1525: Unexpected symbol `end-of-file
+Compilation failed: 1 error(s), 0 warnings
+```
+
+Now run the program:
+
+```console
+$ mono hello.exe
+Hello world!!!
+```
+
+### Interactive Console
+
+Type:
+
+```console
+$ csharp
+Mono C# Shell, type "help;" for help
+
+Enter statements below.
+csharp>
+```
+
+Now you are in interactive mode. You can try following example.
+
+```csc
+csharp> using System;
+csharp> int a = 5;
+csharp> double b = 1.5;
+csharp> Console.WriteLine("{0}*{1} is equal to {2}", a,b,a*b);
+5*1.5 is equal to 7.5
+csharp> a == b
+false
+```
+
+Show all files modified in last 5 days:
+```csc
+csharp> using System.IO;
+csharp> from f in Directory.GetFiles ("mydirectory")
+      > let fi = new FileInfo (f)
+      > where fi.LastWriteTime > DateTime.Now-TimeSpan.FromDays(5) select f;
+{ "mydirectory/mynewfile.cs", "mydirectory/script.sh" }
+```
+
+For more informations look at [Mono documentation page](http://www.mono-project.com/docs/).