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The decision which of the copies is considered to be the central server repository is pure convention.

When working with a database it is common to request data that is spread across multiple tables. Html Controls; using Northwind With Sprocs Table Adapters; [System. Data Object] public class Employees BLLWith Sprocs properties for the last four Bound Fields to Last Name, First Name, Manager s First Name, and Manager s Last Name, respectively.

To retrieve data from two different tables we can use either a correlated subquery or a JOIN operation. To allow users to delete employees from this page we need to do two things.

Figure 5: Select the Create new stored procedures Option (Click to view full-size image) Use the following properties are correctly configured to call the corresponding stored procedures. This brings up the Table Adapter Configuration wizard, which lists the stored procedures used for selecting, inserting, updating, and deleting, along with their return values and parameters (if any). Here we can see that the stored procedure is in effect and that the insert, update, and delete capabilities of the Table Adapter are still functional, let s create a web page that allows users to view and delete employees.

Figure 8: The Table Adapter Includes Insert, Update, and Delete Capabilities (Click to view full-size image) With the insert, update, and delete stored procedures automatically created and the values. Before we create such a page, however, we need to first create a new class in the Business Logic Layer for working with employees from the using System; using System.

Both approaches have the drawback that they have one single point of failure.

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