How to one constraint type argument passed in Generic class ?

Type argument in Generic class can be constrainted using Generic constraint.

Syntax for Generic constrint is below :

class B<T> where T: Typeconstraint

where B is Generic class

      T is type argument

      TypeConstraint is Generic Constraint

Example

public class Stock<X> where X:IStock

This will ensure that type parameter provided for X was derived from IStock.