If You don't need to add the MoreLinq library to the challenge just to get the DistinctBy performance You'll be able to get the same end result using the overload of Linq's Distinct strategy that usually takes within an IEqualityComparer argument. If It is really not possible with LINQ, what https://propertyingurugram.in/krisumi-corporation-to-invest-rs-300-crore-in-phase-2-of-gurgaon-project/