C#/.Net class for launching a CommandLine process and capturing stdout/stderr

ProcessHelper.cs

    public class ProcessHelper
    {
        /// <summary>
        /// Starts a command line process, redirecting both StdOut and StdErr.
        /// </summary>
        /// <param name="fileName">Path to the executable</param>
        /// <param name="arguments">Command line arguments</param>
        /// <param name="onErr">Action to perform when data from the child process is read from StdErr. The action takes 2 parameters: a Process instance (representing the child process) and a string (the data it wrote to StdErr)</param>
        /// <param name="onOut">Action to perform when data from the child process is read from StdOut. The action takes 2 parameters: a Process instance (representing the child process) and a string (the data it wrote to StdOut)</param>
        /// <returns></returns>
        public static Process StartCommandLine(string fileName, string arguments, Action<Process, string> onErr, Action<Process, string> onOut)
        {
            var process = new Process
                              {
                                  StartInfo = new ProcessStartInfo
                                                  {
                                                      FileName = fileName,
                                                      Arguments = arguments,
                                                      RedirectStandardError = true,
                                                      RedirectStandardOutput = true,
                                                      UseShellExecute = false
                                                  },
                                  EnableRaisingEvents = true
                              };

            process.ErrorDataReceived += (s, e) => onErr(s as Process, e.Data);
            process.OutputDataReceived += (s, e) => onOut(s as Process, e.Data);
            process.Start();
            process.BeginErrorReadLine();
            process.BeginOutputReadLine();

            return process;
        }
    }