sealed class MiniDumper
    {
        [Flags]
        public enum Typ : uint
        {
            // From dbghelp.h:
            MiniDumpNormal = 0x00000000,
            MiniDumpWithDataSegs = 0x00000001,
            MiniDumpWithFullMemory = 0x00000002,
            MiniDumpWithHandleData = 0x00000004,
            MiniDumpFilterMemory = 0x00000008,
            MiniDumpScanMemory = 0x00000010,
            MiniDumpWithUnloadedModules = 0x00000020,
            MiniDumpWithIndirectlyReferencedMemory = 0x00000040,
            MiniDumpFilterModulePaths = 0x00000080,
            MiniDumpWithProcessThreadData = 0x00000100,
            MiniDumpWithPrivateReadWriteMemory = 0x00000200,
            MiniDumpWithoutOptionalData = 0x00000400,
            MiniDumpWithFullMemoryInfo = 0x00000800,
            MiniDumpWithThreadInfo = 0x00001000,
            MiniDumpWithCodeSegs = 0x00002000,
            MiniDumpWithoutAuxiliaryState = 0x00004000,
            MiniDumpWithFullAuxiliaryState = 0x00008000,
            MiniDumpWithPrivateWriteCopyMemory = 0x00010000,
            MiniDumpIgnoreInaccessibleMemory = 0x00020000,
            MiniDumpValidTypeFlags = 0x0003ffff,
        };

        //typedef struct _MINIDUMP_EXCEPTION_INFORMATION {
        //    DWORD ThreadId;
        //    PEXCEPTION_POINTERS ExceptionPointers;
        //    BOOL ClientPointers;
        //} MINIDUMP_EXCEPTION_INFORMATION, *PMINIDUMP_EXCEPTION_INFORMATION;
        [StructLayout(LayoutKind.Sequential, Pack = 4)]  // Pack=4 is important! So it works also for x64!
        struct MiniDumpExceptionInformation
        {
          public uint ThreadId;
          public IntPtr ExceptioonPointers;
          [MarshalAs(UnmanagedType.Bool)]
          public bool ClientPointers;
        }

        //BOOL
        //WINAPI
        //MiniDumpWriteDump(
        //    __in HANDLE hProcess,
        //    __in DWORD ProcessId,
        //    __in HANDLE hFile,
        //    __in MINIDUMP_TYPE DumpType,
        //    __in_opt PMINIDUMP_EXCEPTION_INFORMATION ExceptionParam,
        //    __in_opt PMINIDUMP_USER_STREAM_INFORMATION UserStreamParam,
        //    __in_opt PMINIDUMP_CALLBACK_INFORMATION CallbackParam
        //    );
        [DllImport("dbghelp.dll",
          EntryPoint = "MiniDumpWriteDump",
          CallingConvention = CallingConvention.StdCall,
          CharSet = CharSet.Unicode,
          ExactSpelling = true, SetLastError = true)]
        static extern bool MiniDumpWriteDump(
          IntPtr hProcess,
          uint processId,
          IntPtr hFile,
          uint dumpType,
          ref MiniDumpExceptionInformation expParam,
          IntPtr userStreamParam,
          IntPtr callbackParam);

        [DllImport("kernel32.dll", EntryPoint = "GetCurrentThreadId", ExactSpelling = true)]
        static extern uint GetCurrentThreadId();

        [DllImport("kernel32.dll", EntryPoint = "GetCurrentProcess", ExactSpelling = true)]
        static extern IntPtr GetCurrentProcess();

        [DllImport("kernel32.dll", EntryPoint = "GetCurrentProcessId", ExactSpelling = true)]
        static extern uint GetCurrentProcessId();

        public static bool Write(string fileName)
        {
          return Write(fileName, Typ.MiniDumpWithFullMemory);
        }
        public static bool Write(string fileName, Typ dumpTyp)
        {
            using (var fs = new System.IO.FileStream(fileName, System.IO.FileMode.Create, System.IO.FileAccess.Write, System.IO.FileShare.None))
            {
                MiniDumpExceptionInformation exp;
                exp.ThreadId = GetCurrentThreadId();
                exp.ClientPointers = false;
                exp.ExceptioonPointers = System.Runtime.InteropServices.Marshal.GetExceptionPointers();
                bool bRet = MiniDumpWriteDump(
                  GetCurrentProcess(),
                  GetCurrentProcessId(),
                  fs.SafeFileHandle.DangerousGetHandle(),
                  (uint)dumpTyp,
                  ref exp,
                  IntPtr.Zero,
                  IntPtr.Zero);
                return bRet;
            }
        }
    }

using System;
using System.Runtime.InteropServices;

namespace MiniDumpTest1
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                string a = null;
                a.PadLeft(10);

            }
            catch (System.Exception e)
            {
                Console.WriteLine(e);
                string dumpFile = System.IO.Path.Combine(System.Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), "dump.dmp");
                MiniDumper.Write(dumpFile);
            }
        }
    }
}