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The rules for accessing a database are relatively straightforward, but they can t be overemphasized. Open a connection to the database only at the point where you need it, and close it properly as soon as possible. Database connections are a limited resource and represent a potential bottleneck if you don t design your web pages carefully. In addition to making sure you treat your database with this basic degree of respect, you can take a number of additional steps to improve performance: Improve your database with stored procedures: Relational database management systems such as SQL Server are remarkably complex products. They provide a number of configuration options that have nothing to do with ASP.NET but can make a substantial difference in performance. For example, a database that uses intelligently designed stored procedures instead of dynamically generated queries will often perform much better because stored procedures can be compiled and optimized in advance. This is particularly true if a stored procedure needs to perform several related operations at once. Improve your database with profiling and indexes: Defining indexes that match the types of searches you need to perform can result in much quicker row-lookup capabilities. To perfect your database, you ll need to examine it with a profiling tool (such as SQL Server Profiler). These tools record database activity into a special log that can

// run query myReader = myCommand.ExecuteReader(); if (myReader.Read()) { Page.DataBind(); } else { lblError.Text="No results to databind to."; } // close the reader myReader.Close(); Notice that you ve called DataBind() on the whole page rather than the individual Web controls. If you comment out this call, nothing at all will get set. As a slight extension of this example, try experimenting with binding individual Web controls just to prove that binding to one label won t affect the others unless they, too, are explicitly bound. Perhaps create a Panel that contains some of the Web controls and call DataBind() on that to prove that it s not just the DataBind() method in the Page that filters down to its children.

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be reviewed, analyzed, and replayed The profiling utility can usually identify problem areas (such as slow executing queries) and even recommend a new set of indexes that will provide better performance However, to properly profile the database, you ll need to simulate a typical load by running your application Get only the information you need: One of the simplest ways to improve any database code is to reduce the amount of information it retrieves, which will reduce the network load, the amount of time the connection needs to be open, and the size of the final page For example, all searches should be limited to present a small set of rows at a time (perhaps by filtering by date) and should include only the fields that are truly important Note, however, that while this is an excellent rule of thumb, it isn t always the right solution.

The View Cart button can be generated using a similar structure. In your web site, because ASP.NET works by default using a main form (and forms cannot be nested), you ll generate the buttons using links such as https://www.paypal.com/cgi-bin/webscr cmd=_cart&business=your_email_address&item_name=Welcome Back& amount=12.99¤cy=USD&add=1

For example, if you re providing a page that allows a user to edit a database record, it s often easier to retrieve all the information for all the rows at once rather than requery the database every time the user selects a record to get additional information Use connection pooling: In a typical web application, your RDBMS receives requests on behalf of countless clients from several web pages Generally, these connections are open and active for only a short amount of time, and creating them is the most time-consuming step However, if every web page uses the same connection string, database products such as SQL Server will be able to use their built-in connection pooling to reuse a connection for more than one consecutive client, speeding up the process dramatically.

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