Array And ArrayList

Difference Between Array And ArrayList In C#

Array
An Array is a collection of data items of the same type. An Array is reference type so memory for the array is allocated on the heap. We can initialize an Array using the "new" operator and by specifying the type and number of elements inside the Array.

string[] array1=new string[5]; 

ArrayList
ArrayList implements the IList interface. ArrayList is one of the most flexible data structures from C# collection. Collection classes are special classes for data storage and retrieval.

using System.Collection; 

ArrayList a1 = new ArryList(); 
a1.add(null); 
a1.insert(1, ”hi”); 
a1.add(3); 
a1.add(8.23);