How do I generate random dark colors in C#?

Question

I generate a random color this way:

 var random = new Random();
 var color = String.Format(\"#{0:X6}\", random.Next(0x1000000)); 

How can I

Answer 1

An quite simple way to get rid of the "upper half" of brightes colors is to mask the result via

random.Next(0x1000000) & 0x7F7F7F