ProcessMgr.cs

using System;
using System.Runtime.InteropServices;

namespace GTAVCSMM.Helpers
{
    public static class ProcessMgr
    {
        [Flags]
        public enum ProcessAccess : uint
        {
            Terminate = 0x1,
            CreateThread = 0x2,
            SetSessionId = 0x4,
            VmOperation = 0x8,
            VmRead = 0x10,
            VmWrite = 0x20,
            DupHandle = 0x40,
            CreateProcess = 0x80,
            SetQuota = 0x100,
            SetInformation = 0x200,
            QueryInformation = 0x400,
            SetPort = 0x800,
            SuspendResume = 0x800,
            QueryLimitedInformation = 0x1000,
            Synchronize = 0x100000
        }

        [DllImport("ntdll.dll")]
        private static extern uint NtResumeProcess([In] IntPtr processHandle);

        [DllImport("ntdll.dll")]
        private static extern uint NtSuspendProcess([In] IntPtr processHandle);

        [DllImport("kernel32.dll", SetLastError = true)]
        private static extern IntPtr OpenProcess(ProcessAccess desiredAccess, bool inheritHandle, int processId);

        [DllImport("kernel32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool CloseHandle([In] IntPtr handle);

        public static void SuspendProcess(int processId)
        {
            IntPtr hProc = IntPtr.Zero;
            try
            {
                hProc = OpenProcess(ProcessAccess.SuspendResume, false, processId);
                if (hProc != IntPtr.Zero)
                    NtSuspendProcess(hProc);
            }
            finally
            {
                if (hProc != IntPtr.Zero)
                    CloseHandle(hProc);
            }
        }
        public static void ResumeProcess(int processId)
        {
            IntPtr hProc = IntPtr.Zero;
            try
            {
                hProc = OpenProcess(ProcessAccess.SuspendResume, false, processId);
                if (hProc != IntPtr.Zero)
                    NtResumeProcess(hProc);
            }
            finally
            {
                if (hProc != IntPtr.Zero)
                    CloseHandle(hProc);
            }
        }
    }
}