Hi Julia,
If your question is "How" to call / execute a system process (shell !!!) its
very simple..
The following code will invoke the calculator from a C# program
System.Diagnostics.Process proc = new System.Diagnostics.Process();
proc.EnableRaisingEvents=false;
proc.StartInfo.FileName="calc";
proc.Start();
If your question is "use" (!!!) shell command from C#, then As Far As I
Know.. the framework does not provide any managed way to achieve this.. You
need to fall upon interop.
HTH,
Happy Coding