Answer Posted / mithun

By using a generic class, we can create classes that is type safe at compile time.

ArrayList is a highly convenient collection class that can be used without modification to store any reference or value type. Any reference or value type that is added to an ArrayList is implicitly upcast to Object. If the items are value types, they must be boxed when they are added to the list, and unboxed when they are retrieved. Both the casting and the boxing and unboxing operations decrease performance

ArrayList list = new ArrayList();
list.Add(3);
list.Add("It is raining in Redmond.");
int t = 0;
foreach (int x in list)
{
t += x;
}

This will cause a programming error, and this error will not be detected until runtime.


In the generic List<T> collection, the same operation of adding items to the collection
List<int> list1 = new List<int>();
list1.Add(3);
list1.Add("It is raining in Redmond."); // this gives Compile-time error.

Now you can create a list that is not only safer than ArrayList, but also significantly faster, especially when the list items are value types.

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