using System.Diagnostics;

Process p = new Process();
p.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
p.StartInfo.FileName = processname;
p.StartInfo.Arguments = arguments;

p.Start();
p.WaitForExit()

public static void execute(string processname, string arguments) {
   Process p = new Process();
   p.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
   p.StartInfo.FileName = processname;
   p.StartInfo.Arguments = arguments;
   p.StartInfo.UseShellExecute = false;
   p.StartInfo.RedirectStandardOutput = true;
   p.StartInfo.RedirectStandardError = true;
   p.Start();
   p.WaitForExit();

   var stdout = p.StandardOutput.ReadToEnd();
   var stderr = p.StandardError.ReadToEnd();
}