public sealed class Command
{
    public static string Windows(string arg, string[] commands)
    {
        return Execute("cmd.exe", arg, commands);
    }

    public static string Execute(string fileName, string arg, string[] commands)
    {
        Process proc = new Process();
        proc.StartInfo.CreateNoWindow = true;
        proc.StartInfo.FileName = fileName;
        proc.StartInfo.UseShellExecute = false;
        proc.StartInfo.RedirectStandardError = true;
        proc.StartInfo.RedirectStandardInput = true;
        proc.StartInfo.RedirectStandardOutput = true;
        proc.StartInfo.Arguments = arg;
        proc.StartInfo.Verb = "runas";
        proc.Start();

        if (commands.Length > 0)
        {
            for (int i = 0; i < commands.Length; i++)
            {
                proc.StandardInput.WriteLine(commands[i]);
            }
        }

        proc.StandardInput.AutoFlush = true;
        proc.StandardInput.WriteLine("exit");
        string output = proc.StandardOutput.ReadToEnd();
        proc.StandardError.ReadToEnd();
        proc.WaitForExit();
        proc.Close();
        proc.Dispose();

        return output;
    }
}

string str = "schtasks.exe /create /tn \"任务名\" /rl highest /sc ONSTART /delay 0000:30 /tr \"可执行程序绝对路径\" /f"
Command.Windows("schtasks.exe", new string[] {str});

string str = "schtasks /delete  /TN \"任务名\" /f";
Command.Windows("schtasks.exe", new string[] {str});