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public delegate int LowLevelKeyboardProcDelegate(int nCode, int wParam, ref KBDLLHOOKSTRUCT lParam);
private const int WH_KEYBOARD_LL = 13; // idHook - type of hook procedure
private static int intLLKey; // hook handle (return value)

//private static LowLevelKeyboardProcDelegate lpfn; // pointer to the hook procedure
private void LockKeyboard()
{

string lpModuleName = Process.GetCurrentProcess().MainModule.ModuleName;
int hMod = (int)GetModuleHandle(lpModuleName);
//lpfn = this.LowLevelKeyboardProc;
//intLLKey = SetWindowsHookEx(WH_KEYBOARD_LL, lpfn, hMod, 0);
intLLKey = SetWindowsHookEx(WH_KEYBOARD_LL, LowLevelKeyboardProc, hMod, 0);
//KillStartMenu();

}

private void UnlockKeyboard()
{

UnhookWindowsHookEx(intLLKey);
//ShowStartMenu();

}

[DllImport("user32", EntryPoint = "SetWindowsHookExA", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling =
true)]
public static extern int SetWindowsHookEx(int idHook, LowLevelKeyboardProcDelegate lpfn, int hMod, int dwThreadId);
[DllImport("user32", EntryPoint = "UnhookWindowsHookEx", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling =
true)]
public static extern int UnhookWindowsHookEx(int hHook);
[DllImport("user32", EntryPoint = "CallNextHookEx", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling =
true)]
public static extern int CallNextHookEx(int hHook, int nCode, int wParam, ref KBDLLHOOKSTRUCT lParam);

// needed to disable start menu
[DllImport("user32.dll")]
private static extern int FindWindow(string className, string windowText);
[DllImport("user32.dll")]
private static extern int ShowWindow(int hwnd, int command);

// needed to get module handle
[DllImport("kernel32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr GetModuleHandle(string lpModuleName);
public struct KBDLLHOOKSTRUCT


{
public int vkCode;
public int scanCode;
public int flags;
public int time;
public int dwExtraInfo;
}

public int LowLevelKeyboardProc(int nCode, int wParam, ref KBDLLHOOKSTRUCT lParam)
{
bool blnEat = false;
switch (wParam)
{

case 256: // WM_KEYDOWN
case 257: // WM_KEYUP
case 260: // WM_SYSKEYDOWN
case 261: // WM_SYSKEYUP
blnEat = ((lParam.vkCode == 0x09) && (lParam.flags == 0x20)) | // Alt+Tab
((lParam.vkCode == 0x1B) && (lParam.flags == 0x20)) | // Alt+Esc
((lParam.vkCode == 0x1B) && (lParam.flags == 0x00)) | // Ctrl+Esc
((lParam.vkCode == 0x5B) && (lParam.flags == 0x01)) | // Left Windows Key
((lParam.vkCode == 0x5C) && (lParam.flags == 0x01)) | // Right Windows Key
((lParam.vkCode == 0x73) && (lParam.flags == 0x20)); // Alt+F4
break;
}

if (blnEat == true)
{
return 1;
}
else
{
// chain to the next hook procedure. allow other applications that
// have installed hooks to receive hook notification
return CallNextHookEx(0, nCode, wParam, ref lParam);
}
}

private const int SW_HIDE = 0;
private const int SW_SHOW = 1;
public void KillStartMenu()
{
int hwnd = FindWindow("Shell_TrayWnd", "");
ShowWindow(hwnd, SW_HIDE);
}

public static void ShowStartMenu()
{
int hwnd = FindWindow("Shell_TrayWnd", "");
ShowWindow(hwnd, SW_SHOW);
}
}