If You do not need to include the MoreLinq library on your challenge just to find the DistinctBy operation You'll be able to get the same final result utilizing the overload of Linq's Unique approach that normally takes in an IEqualityComparer argument. one Also see this similar issue and its https://propertyingurugram.in/realty-major-dlf-sells-properties-worth-rs-1400-crore-in-gurugram-panchkula/