Reference Type Constraint: A reference type constraint restricts a type parameter to a reference type.

 
using System;
using System.Collections;


public class Starter {
    public static void Main() {
        // MyClass<int> obj1=new MyClass<int>(); [illegal]
        MyClass<XClass> obj2 = new MyClass<XClass>();

    }
}

public class MyClass<T> where T : class {

    public void Iterate(T data) {
    }
}

public class XClass {
}

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1.	There are five types of constraints:
2.	Combination of Overriding Generic Methods
3.	A base class constraint
4.	Use an interface constraint
5.	A new() constructor constraint
6.	Demonstrate a reference constraint
7.	Demonstrate a value type constraint
8.	A type parameter can be used as a constraint
9.	Reference Type Constraint
10.	Default Constructor Constraint
11.	Derivation Constraint
12.	constructor constraint

Reference Type Constraint: A reference type constraint restricts a type parameter to a reference type. : Generic Constraint « Generics « C# / C Sharp

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