The yield (return) usage

The yield keyword is a C# 2.0 feature. It’s been a long time that C# 3.0 is in the market, so much so C# 4.0 is looming over the horizon. Yet so many C# developers are not aware of its usage. Even I was not 100% clear, until I read (long back) this post from Joshua. Obviously, it’s a must read for anyone who can’t explain the usage of yield return.