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ShoppingCartAddItem ShoppingCartAddItem is called when the visitor clicks the Add to Cart button for one of the products. If the selected product already exists in the shopping cart, its quantity is increased by one; if the product doesn t exist, a new record is added to the shopping cart. Not surprisingly, the parameters ShoppingCartAddItem receives are CartID and ProductID. The stored procedure first searches to determine whether the product mentioned (ProductID, CartID) pair exists in the ShoppingCart table. If it does, the stored procedure updates the current product quantity in the shopping cart by adding one unit. Otherwise, the procedure creates a new record for the product in ShoppingCart with a default quantity of 1, but not before checking whether the mentioned @ProductID is valid. Add the following stored procedure to your BalloonShop database: CREATE Procedure ShoppingCartAddItem (@CartID char(36), @ProductID int) AS IF EXISTS (SELECT CartID FROM ShoppingCart WHERE ProductID = @ProductID AND CartID = @CartID) UPDATE ShoppingCart SET Quantity = Quantity + 1 WHERE ProductID = @ProductID AND CartID = @CartID ELSE IF EXISTS (SELECT Name FROM Product WHERE ProductID=@ProductID) INSERT INTO ShoppingCart (CartID, ProductID, Quantity, DateAdded) VALUES (@CartID, @ProductID, 1, GETDATE()) You use the GETDATE system function to retrieve the current date and manually populate the DateAdded field, but you could set the GETDATE function as the default value of that field instead. ShoppingCartRemoveItem Following is the stored procedure that removes a product from the shopping cart. This happens when the visitor clicks the Remove button for one of the products in the shopping cart. Add the ShoppingCartRemoveItem stored procedure to your BalloonShop database: CREATE PROCEDURE ShoppingCartRemoveItem (@CartID char(36), @ProductID int) AS DELETE FROM ShoppingCart WHERE CartID = @CartID and ProductID = @ProductID

If you re using the full version of SQL Server 2005, you won t need to supply the instance name (you can use just localhost instead of localhost\SQLEXPRESS). You may also need to change the server name, depending where your database is installed. The previous command line assumes that the database is installed on the current computer. The SqlCmd.exe utility provides a command prompt where you can enter SQL commands. Use it to enter the following SQL statements:

EXEC sp_configure 'show advanced options', '1' GO RECONFIGURE GO EXEC sp_configure 'clr enabled', 1 GO RECONFIGURE

Indeed, any property that you can set within the HTML markup can be modified within code. You ll see this when you start changing the SQL query that is executed by directly modifying the SelectCommand property.

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<location path="CatalogAdmin.aspx"> <system.web> <authorization> <deny users=" " /> </authorization> </system.web> </location> With this setting, any logged-in users (not only administrators) would be allowed access to the admin page.

Then type quit to exit the SqlCmd tool. On the other hand, if your cached item expires immediately, the most likely problem is that you ve broken one of the rules for writing commands that work with notifications, as described earlier.

The most performance-critical area in most web applications is the data layer. But many ASP .NET developers don t realize that you can dramatically reduce the burden on your database and increase the scalability of all your web applications with just a little caching code. However, with any performance-optimization strategy, the only way to gauge the value of a change is to perform stress testing and profiling. Without this step, you might spend a great deal of time perfecting code that will achieve only a minor improvement in performance or scalability, at the expense of more effective changes.

In this example, you re connecting to a SQL Server database, and the definition of the SqlDataSource is complete, simply specifying the ConnectionString will connect to the database. However, this isn t the whole story. You re actually providing, by omission in this example, one further piece of information that the SqlDataSource needs. The SqlDataSource can be used to connect to any data source, provided that there is a data provider for it, but as yet, you have not told the SqlDataSource what type of connection string you ve provided. You need to do this using the ProviderName property. The ProviderName property can have several different values, depending on which data provider you want to use. The standard data providers are listed Table 6-3. Table 6-3. Standard Data Providers

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