How to remove duplicate values from ArrayList

Problem:
I have one ArrayList which contains a lot of duplicate values. I need to create a function to remove duplicate values from the ArrayList. My ArrayList contains objects of same type.

Solution:

You can use LINQ distinct method to filter out duplicate values if ArrayList contains objects of same type.



using System.Collections;
using System.Linq;


ArrayList duplicateList= new ArrayList();
duplicateList.Add(10);
duplicateList.Add(20);
duplicateList.Add(10); 
duplicateList.Add(30);
duplicateList.Add(40); 
duplicateList.Add(50);
duplicateList.Add(40); 
duplicateList.Add(20);

public ArrayList RemoveDuplicate(ArrayList duplicate)
{
       ArrayList distinctArr= new ArrayList();       duplicate.ToArray().Distinct().ToList()
                              .ForEach(d=> distinctArr.Add();
       return distinctArr;
}


 ArrayList distinctList= new ArrayList();
 distinctList = RemoveDuplicate(duplicateList);