Check against IntPtr.Zero, not null

[ViRb3]

For an example here:

DLL-Injection/DllInjection/DllInjection/Program.cs

Lines 176 to 187 in a250c9d

	// Open handle to the target process
	IntPtr ProcHandle = OpenProcess(
	ProcessAccessFlags.All,
	false,
	ProcId);
	if (ProcHandle == null)
	{
	Console.ForegroundColor = ConsoleColor.Red;
	Console.WriteLine("[!] Handle to target process could not be obtained!");
	Console.ForegroundColor = ConsoleColor.White;
	System.Environment.Exit(1);
	}

The result will never be null, but it could be of type IntPtr.Zero, which is what you are trying to check.