Difference between Arraylist and Generic List

Arraylist

Arraylist accept values as object

So We can give any type of data in to that.

Here in this eg: an arraylist object accepting 

values like String,int,decimal, char and a custom object

ArrayList arr = new ArrayList();

arr.Add("Sabu");

arr.Add(234);

arr.Add(45.236);

arr.Add(emp);

arr.Add('s');

This process is known as boxing

Geniric

Main advantage of Generic List is we can specify the type of data 

List<int> intLst = new List<int>();

intLst.Add(12);

Here List accepting values as int only

List<Employee> empLst = new List<Employee>();

empLst.Add(new Employee("1", "Sabu"));

Here List accepting Employee Objects only

 If constructor is private then we can not create the object and inherit of that
class.

 -> Sealed can not be used for virtual, Abstract and static classes.

Non - Generic collection class - which collection can hold the different type of data.
Generic collection class - which collection can hold the same type of data.