get process parent c#

/*
	    /// <summary>
		/// A utility class to determine a process parent.
		/// </summary>
		[StructLayout(LayoutKind.Sequential)]
		public struct ParentProcessUtilities
		{
			// These members must match PROCESS_BASIC_INFORMATION
			internal IntPtr Reserved1;
			internal IntPtr PebBaseAddress;
			internal IntPtr Reserved2_0;
			internal IntPtr Reserved2_1;
			internal IntPtr UniqueProcessId;
			internal IntPtr InheritedFromUniqueProcessId;

			[DllImport("ntdll.dll")]
			private static extern int NtQueryInformationProcess(IntPtr processHandle, int processInformationClass, ref ParentProcessUtilities processInformation, int processInformationLength, out int returnLength);

			/// <summary>
			/// Gets the parent process of the current process.
			/// </summary>
			/// <returns>An instance of the Process class.</returns>
			public static Process GetParentProcess()
			{
				return GetParentProcess(Process.GetCurrentProcess().Handle);
			}

			/// <summary>
			/// Gets the parent process of specified process.
			/// </summary>
			/// <param name="id">The process id.</param>
			/// <returns>An instance of the Process class.</returns>
			public static Process GetParentProcess(int id)
			{
				Process process = Process.GetProcessById(id);
				return GetParentProcess(process.Handle);
			}

			/// <summary>
			/// Gets the parent process of a specified process.
			/// </summary>
			/// <param name="handle">The process handle.</param>
			/// <returns>An instance of the Process class.</returns>
			public static Process GetParentProcess(IntPtr handle)
			{
				ParentProcessUtilities pbi = new ParentProcessUtilities();
				int returnLength;
				int status = NtQueryInformationProcess(handle, 0, ref pbi, Marshal.SizeOf(pbi), out returnLength);
				if (status != 0)
					throw new Win32Exception(status);

				try
				{
					return Process.GetProcessById(pbi.InheritedFromUniqueProcessId.ToInt32());
				}
				catch (ArgumentException)
				{
					// not found
					return null;
				}
			}
		}
*/