> 
> **Possible Duplicates:**   
> 
> [What are the correct version numbers for C#?](https://stackoverflow.com/questions/247621/what-are-the-correct-version-numbers-for-c)   
> 
> [List of new features in C# 2.0, 3.0 and 4.0](https://stackoverflow.com/questions/3174942/list-of-new-features-in-c2-0-3-0-and-4-0)
> 
> 
> 

What is the difference between C# versions like ver 2.0 and ver 3.0?

Please help me explain in detail. What are the exact differences?