Question

I have two DataTables : dt1 & dt2. dt1 contains one field, ID and dt2 contains two fields, ass_ID and Name.

I have to get the number of matched IDs from these two DataTables. How do I do this? Any easy way to compare them or anything to get the count of matched IDs (common IDs) in both of these tables?

Answer 1

var count = (from dr1 in dt.AsEnumerable()
            from dr2 in dt2.AsEnumerable()
            where dr1.Field<int>("ID") == dr2.Field<int>("ass_ID")
            select dr1).Count();

Or

var count = (from dr1 in dt1.AsEnumerable()
             join j in dt2.AsEnumerable() on dr1.Field<int>("ID") equals j.Field<int>("ass_ID")
             select j).Count();