Why use generic constraints in C#

Question

I\'ve read an excellent article on MSDN regarding Generics in C#.

The question that popped in my head was - why should i be using generic constraints?

For ex

Answer 1

Well for a start, you can call methods defined in ISomething within the code for the generic method / methods on the generic class. If T was allowed to be any type then this would not be possible (although you could always do some runtime casting).

So it allows you to enforce compile-time constraints on what T can be and therefore rely on these constraints when you write the code - turning runtime errors into compile time errors.