If I have the following code, I have no runtime or compilation problems:

if (ConsoleAppBase.NORMAL_EXIT_CODE == code)
{
    StdOut.WriteLine(msg);
}
else
{
    StdErr.WriteLine(msg);
}

However, in trying to make this more concise, I switched to the following code:

(ConsoleAppBase.NORMAL_EXIT_CODE == code
    ? StdOut
    : StdErr
).WriteLine(msg);

When I have this code, I get the following exception at runtime:

System.ObjectDisposedException: Cannot write to a closed TextWriter

Can you explain why this happens? Can I avoid it and have more concise code like I wanted?