Possible Duplicate: casting vs using the 'as' keyword in the CLR I have seen two different ways of casting in C#. For example: MyObj foo = (MyObj) bar; // this is what I see most of the times MyObj foo = bar as MyObj; // I do see this sometimes So, what is the basic difference? What are the proper names for the style 1 and style 2 casting? How do I decide when to use what? Is there any major performance issues? Is there anything else I should know of related to this topic? Thanks a lot for looking into this :)

C# different ways of casting -- (T)obj vs obj as T

Possible Duplicate:
casting vs using the 'as' keyword in the CLR

I have seen two different ways of casting in C#.

For example:

MyObj foo = (MyObj) bar; // this is what I see most of the times
MyObj foo = bar as MyObj; // I do see this sometimes

Thanks a lot for looking into this :)