Question

I have 2 Datatable dt and dt2

 var dt = MultiCheckCombo3.GetAllChechedBox();

 var dt2 =manager.GetAllStudents(student_id, classid);

In the first table dt are two columns “id_staff” and “name_staff”
In the second table are several columns but 2 of them repeat “id_staff” and “name_staff”
I want to create a new DataTable with the fields “id_staff” and “name_staff” common DataTable dt and dt2

how joined these tables?
dt3= dt+dt2

Answer 1

You can use Linq to join the two tables. See the following example.

Code from the article:

var innerGroupJoinQuery =
    from category in categories
    join prod in products on category.ID equals prod.CategoryID into prodGroup
    select new { CategoryName = category.Name, Products = prodGroup };