How to remove Duplicates from List

There are multiple ways to remove duplicates from List in C# , In this article I have described four ways with implementation

1) Iterate and push one by one to unique List if it doesn’t exist

2) Use LINQ Distinct method

3) By using ToHashSet method which removes the duplicates

4) Group By

First method with Empty List and iteration with contains method is most efficient b/w them.

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