Hi @MitheshBolla .
Firstly, Could you Check with the below Expression if the same error happens or a Validation Error is present :
DT.AsEnumerable().Select(r => r["ID"].ToString()).ToArray()
If the above doesn’t work, Could you maybe perform a Debug and Check the Column Datatypes of Datatable that was retrieved from SQL query ?
Checking the Datatype can be done in the below Way :
