ProcessStartInfo psi = new ProcessStartInfo();            
psi.FileName = "netsh";            
psi.UseShellExecute = false;
psi.RedirectStandardError = true;
psi.RedirectStandardOutput = true;
psi.Arguments = "SOME_ARGUMENTS";

Process proc = Process.Start(psi);                
proc.WaitForExit();
string errorOutput = proc.StandardError.ReadToEnd();
string standardOutput = proc.StandardOutput.ReadToEnd();
if (proc.ExitCode != 0)
    throw new Exception("netsh exit code: " + proc.ExitCode.ToString() + " " + (!string.IsNullOrEmpty(errorOutput) ? " " + errorOutput : "") + " " + (!string.IsNullOrEmpty(standardOutput) ? " " + standardOutput : ""));