How to identify duplicate rows based on 3 different columns?

[prasath17 (Guru)]

@Tana20 - Please check this

Find and remove duplicates in two datatables based on values of two columns

Hello, i am trying to delete duplicate datarows from two different tables based on two columns. [example 11] I have two data tables that look like the sample sheet above, where I want to delete the duplicates found based on both column C and column D. Is there a linq query that i can use to do this? Thanks in advance!