The URL contains the primary key value of a record in the database. Your application parses the URL parameter, extracts the primary key value, and performs the record lookup in the database.
In this example, a query string called “ID” is used in the URL to convey a primary key value of “Bob Pinkston”. Bob Pinkston’s record is retrieved from the Customers table and displayed by a series of ASP.NET controls in the generated web page.
Use the Add WHERE Clause dialog to select URL parameters to constrain the selection criteria by a parameter passed into the control from the page’s URL. This is a very common way of requesting individual records to be displayed.