Compare 2 different Excel files LinQ


I have a Excel File and i want to compare it with the column of other excel file, my process, save the first excel in a DT1, then i create a empty data table with the structure of the DT1 and put an each row activity for DT1 and inside it a get row item then an if with this :

((From r In DT3.Select where r(0).ToString.Equals(row(0).ToString)Select r).FirstOrDefault) IsNot Nothing

And if that data dosn’t exist, it save it in DT1… the question is…can i Use the LinQ to use only one assign for the process?