Extracting screen scraping strings

hello,

I saw it while looking for a post in the forum.

a@a.a
werlwerlewldsfsd
b@b.b
Itrudrudrudrudrudrudrudrudrudrud
c@c.c
drudrudrudrudrudrudrudrudrud
a@a.a

If you want to collect the above three separately by “,” I think you can use it as below, but how can I respond if I have one or two or overlap ?
ex) a@a.a, b@b.b, c@c.c

dt3.ElementAt(dt3.Count+1).ToString+", “+dt3.ElementAt(dt3.Count+2).ToString+”, "+dt3.ElementAt(dt3.Count+3).ToString

is notworking…

Already answered @CK_CHECK