IEnumerable to string

Question

I have a DataTable that returns

IDs
,1
,2
,3
,4
,5
,100
,101

I want to convert this to single string value, i.e:

,1,2,3,4,5,100         


        

Answer 1

 String.Join(
      ",",
      _tbl.AsEnumerable()
          .Select(r => r.Field("ID").ToString())
          .ToArray())