To create our Northwind DAL, right-click on the project node
in the solution explorer, and select "Add New Item". Then select the "DataSet"
option and name it "Northwind.xsd":
This will prompt me as to whether I want to add it under the
“App_Code” directory. When I click “yes” it will bring up a data-design
surface, and (if in a web project) automatically launch the “Create
TableAdapter” wizard (if you are in a class library project you need to right
click and choose “Add->Table Adapter to launch this wizard):