Microsoft.Win32.Win32Native.MakeHRFromErrorCode C# (CSharp) Method

        internal static int MakeHRFromErrorCode(int errorCode)
        {
            BCLDebug.Assert((0xFFFF0000 & errorCode) == 0, "This is an HRESULT, not an error code!");
            return unchecked(((int)0x80070000) | errorCode);
        }