Difference between Arraylist and Generic List

Difference between Arraylist and Generic List

private void button1_Click
           (object sender, EventArgs e)
       {
           //Arraylist - Arraylist accept values as object
           //So i 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

           Employee emp = new Employee("2", "Litson");
           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

           //To get inserted vales from arraylist we have to specify the index.
           //So it will return that values as object.
           //we have to cast that value from object to its original type.

           String name = (String)arr[0];
           int num = (int)arr[1];
           decimal dec = (decimal)arr[2];
           Employee em = (Employee)arr[3];
           char c = (char)arr[4];
           //This process that is converting from object to its original type is known as unboxing
           //------------------------------------------------------------------------------------
           //Generic List
           //List<>

           //Main advantage of Generic List is we can specify the type of data we are going to insert in to
           //List. So that we can avoid boxing and unboxing
           //Eg:
           List strLst = new List();
           strLst.Add("Sabu");//Here List accepting values as String only
           strLst.Add("Litson");
           strLst.Add("Sabu");
           strLst.Add("Sabu");

           List intLst = new List();
           intLst.Add(12);//Here List accepting values as int only
           intLst.Add(14);
           intLst.Add(89);
           intLst.Add(34);

           List decLst = new List();
           decLst.Add(2.5M);//Here List accepting values as deciaml only
           decLst.Add(14.4587m);
           decLst.Add(89.258m);
           decLst.Add(34.159m);

           List empLst = new List();
           empLst.Add(new Employee("1", "Sabu"));//Here List accepting Employee Objects only
           empLst.Add(new Employee("2", "Mahesh"));
           empLst.Add(new Employee("3", "Sajith"));
           empLst.Add(new Employee("4", "Binu"));


           //To get values from Generic List
           String nme = strLst[0]; //No need of casting
           int nm = intLst[0];
           Decimal decVal = decLst[0];
           Employee empVal = empLst[0];
       }