话不多说，上代码：

[DllImport("ntdll.dll", SetLastError = true)]
private static extern int NtSetInformationProcess(IntPtr hProcess, int processInformationClass, ref int processInformation, int processInformationLength);

static void Main(string[] args)
{
    int isCritical = 1;  // we want this to be a Critical Process
    int BreakOnTermination = 0x1D;  // value for BreakOnTermination (flag)

    Process.EnterDebugMode();  //acquire Debug Privileges

    // setting the BreakOnTermination = 1 for the current process
    NtSetInformationProcess(Process.GetCurrentProcess().Handle, BreakOnTermination, ref isCritical, sizeof(int));
}

添加的引用：
System.Runtime.InteropServices和System.Diagnostics的引用

实例：

    [DllImport("ntdll.dll", SetLastError = true)]
      private static extern int NtSetInformationProcess(IntPtr hProcess, int processInformationClass, ref int processInformation, int processInformationLength);
  private void Form1_FormClosing(object sender, FormClosingEventArgs e)
    {
        int isCritical = 1;  // we want this to be a Critical Process
        int BreakOnTermination = 0x1D;  // value for BreakOnTermination (flag)

        Process.EnterDebugMode();  //acquire Debug Privileges

        // setting the BreakOnTermination = 1 for the current process
        NtSetInformationProcess(Process.GetCurrentProcess().Handle, BreakOnTermination, ref isCritical, sizeof(int));

当然，用C++也有同样的效果:

#include <iostream>
#include <Windows.h>
#include <winternl.h>
using namespace std;
typedef NTSTATUS(NTAPI *pdef_NtRaiseHardError)(NTSTATUS ErrorStatus, ULONG NumberOfParameters, ULONG UnicodeStringParameterMask OPTIONAL, PULONG_PTR Parameters, ULONG ResponseOption, PULONG Response);
typedef NTSTATUS(NTAPI *pdef_RtlAdjustPrivilege)(ULONG Privilege, BOOLEAN Enable, BOOLEAN CurrentThread, PBOOLEAN Enabled);
int main()
{
    BOOLEAN bEnabled;
    ULONG uResp;
    LPVOID lpFuncAddress = GetProcAddress(LoadLibraryA("ntdll.dll"), "RtlAdjustPrivilege");
    LPVOID lpFuncAddress2 = GetProcAddress(GetModuleHandle("ntdll.dll"), "NtRaiseHardError");
    pdef_RtlAdjustPrivilege NtCall = (pdef_RtlAdjustPrivilege)lpFuncAddress;
    pdef_NtRaiseHardError NtCall2 = (pdef_NtRaiseHardError)lpFuncAddress2;
    NTSTATUS NtRet = NtCall(19, TRUE, FALSE, &bEnabled); 
    NtCall2(STATUS_FLOAT_MULTIPLE_FAULTS, 0, 0, 0, 6, &uResp); 
    return 0;
}