@dasharath.nd
Give a try on Following
Use an assign Activity
Left side: dtResult - datatype of Datatable
Use an assign Activity
Left Side : dtResult
Right side Respekt the Line breaks)
(From d in dt2.asenumerable
Join dl In dt1.asenumerable
On d(0).toString.trim Equals dl(0).toString.trim
Let ra= dl.Itemarray
Select dtResult.Rows.Add(ra)).CopyToDataTable
In dtResult you will get the lookup result
Find starter help here
DataTable_Join_1Col.xaml (10.3 KB)