What-is-Yield-Keyword-in-C-do

What is the use of yield keyword in C#, when we should use yield in C#.net. Will C# yield keyword boost performance of .Net code execution? Or what is the benefit of using C# keyword These are the questioned which have in mind for most of the Micirisoft .Net developers. Some more doubts hanging there would be like why there is no Yield keyword in VB.net while C#.net has it The exact usage of C# yield keyword is a bit tricky to understand till you see what is exactly happening behind the scene while using a yield key word in C# .net .