Find distinct records with the help of multiple keys within a collection in C#. Here, multiple keys are present in an string array.

For example:

If we have a collection, 

collection = { [

{firstName: "John", lastName: "Cena", age: 40}

,{firstName: "Prashant", lastName: "Gupta", age: 45}] }

and we have an array:

multiplekeys = {"lastName","age"}

How can we find the distinct records in the collection using multiple keys?