The first thing we need to do is create a test solution. In this chapter, we will start from the data access layer. Perform the following steps:
Start Visual Studio.
Create a new class library project,
NorthwindDAL, with solution nameLINQNorthwind(make sure that the Create directory for solution option is checked to specify the solution name).Change the
Class1.csfile toProductDAO.cs. This will also change the class name and all related places in the project.
Now, you should have a new solution with the empty data access layer class. Next, we will add a model to this layer and create the business logic layer and the service interface layer.