Trying to send a command to the server after it has crashed will result in an unhandled exception.

Line 65 of SourceRcon.cs

```
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
An unhandled exception of type 'System.Net.Sockets.SocketException' occurred in System.dll
Additional information: An existing connection was forcibly closed by the remote host
```
