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# CSharp
C# is available on the cluster.
```console
$ ml av mono
-------------------- /apps/modules/lang ---------------
```
!!! note
Use the `ml av mono` command to get up-to-date versions of the modules.
Activate C# by loading the Mono module:
```console
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```
## Examples
### Hello World
Copy this code to a 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
```
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 the interactive mode. You can try the 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" }
```
## MPI.NET
MPI is available for mono:
```csc
using System;
using MPI;
class MPIHello
{
static void Main(string[] args)
{
using (new MPI.Environment(ref args))
{
Console.WriteLine("Greetings from node {0} of {1} running on {2}",
Communicator.world.Rank, Communicator.world.Size,
MPI.Environment.ProcessorName);
}
}
}
```
Compile and run the program:
```console
$ qsub -I -A PROJECT_ID -q qexp -l select=2:ncpus=128,walltime=00:30:00
$ mcs -out:csc.exe -reference:/apps/tools/mpi.net/1.0.0-mono-3.12.1/lib/MPI.dll csc.cs
$ mpirun -n 4 mono csc.exe
Greetings from node 2 of 4 running on cn204
Greetings from node 0 of 4 running on cn204
Greetings from node 3 of 4 running on cn199
Greetings from node 1 of 4 running on cn199
```
For more information, see the [Mono documentation page][a].
[a]: http://www.mono-project.com/docs/