How to get difference between two DataTables

Question

I have these two datatables and I want to get the difference between them. Here is an example:

Table1
-------------------------
ID  |   Name 
---------------         


        

Answer 1

I will try to do it on a column level rather than a DataTable.

IEnumerable id_table1 = table1.AsEnumerable().Select(val=> (int)val["ID"]);
IEnumerable id_table2  = table2.AsEnumerable().Select(val=> (int)val["ID"]);
IEnumerable id_notinTable1= id_table2.Except(id_table1);

Just adding a .Select() to your answer...