System.ConsolePal.ConsoleHandleIsWritable C# (CSharp) Method

        private static unsafe bool ConsoleHandleIsWritable(IntPtr outErrHandle)
        {
            // Windows apps may have non-null valid looking handle values for 
            // stdin, stdout and stderr, but they may not be readable or 
            // writable.  Verify this by calling WriteFile in the 
            // appropriate modes. This must handle console-less Windows apps.
            int bytesWritten;
            byte junkByte = 0x41;
            int r = Interop.Kernel32.WriteFile(outErrHandle, &junkByte, 0, out bytesWritten, IntPtr.Zero);
            return r != 0; // In Win32 apps w/ no console, bResult should be 0 for failure.
        }