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The original ASP became more popular than even Microsoft anticipated, and it wasn t long before it was being wedged into all sorts of unusual places, including mission-critical business applications and highly trafficked e-commerce sites. Because ASP hadn t been designed with these uses in mind, a number of problems began to appear. What began as a simple solution for creating interactive web pages became a complicated discipline that required knowledge in several fields as well as some painful experience. If you ve programmed with ASP before, you may already be familiar with some or all of these problems: Scripting limitations: ASP applications rely on the VBScript language, which suffers from a number of limitations, including poor performance. To overcome these problems, developers usually need to add separately developed components, which add a new layer of complexity. In ASP.NET, web pages are designed in a modern .NET language, not a scripting language. No application structure: ASP code is inserted directly into a web page along with the HTML markup. The resulting tangle of code and HTML has nothing in common with today s modern, object-oriented languages. As a result, web form code can rarely be reused or modified without hours of effort. Headaches with deployment and configuration: If you want to update a component used in an ASP website, you often need to manually stop and restart the server. This process just isn t practical on a live website. Changing configuration options can be just as ugly. Thankfully, ASP.NET includes a slew of features that allow websites to be dynamically updated and reconfigured.

As a general rule, if performance can be improved this way, it s okay to break the strict limits between tiers just a little bit (for example, add some of the business rules to the data tier or vice versa), if these rules are not likely to change in time Otherwise, keeping all the business rules in the middle tier is preferable because it generates a cleaner application that is easier to maintain Finally, don t be tempted to access the data tier directly from the presentation tier This is a common mistake that is the shortest path to a complicated, hard-to-maintain, and inflexible system In many data access tutorials or introductory materials, you ll be shown how to perform simple database operations using a simple UI application In these kinds of programs, all the logic is probably written in a short, single file instead of separate tiers.

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3. Choose a location for the website. The location specifies where the website files will be stored. Typically, you ll choose File System and then use a folder on the local computer (or a network path). You can type in a directory by hand in the Location text box and skip straight to step 5. Alternatively, you can click the Browse button, which shows the Choose Location dialog box (see Figure 4-2).

8. To determine which items were selected in the Web list control, you must iterate through the Web control and build up the query from the results: // set up SQL query for Player table StringBuilder Query = new StringBuilder("SELECT PlayerID, PlayerName, PlayerManufacturerID, PlayerCost, PlayerStorage FROM Player WHERE PlayerManufacturerID IN ("); bool gotResult = false; for (int i=0; i<ListBox1.Items.Count; i++) { if (ListBox1.Items[i].Selected) { if (gotResult == true) Query.Append(","); Query.Append(ListBox1.Items[i].Value); gotResult = true; } } Query.Append(")"); 9. Now you find out if any items were checked. If so, you run the query you built. If not, you clear the grid. // get results if we have a selection if (gotResult) { // set the query to execute myCommand.CommandText = Query.ToString(); // run the query SqlDataReader myReader = myCommand.ExecuteReader(); // set up the GridView GridView1.DataSource = myReader; GridView1.DataBind(); // close the reader myReader.Close(); } else { // clear the GridView GridView1.DataSource = null; GridView1.DataBind(); } }

4. Using the Choose Location dialog box, browse to the directory where you want to place the website. Often, you ll want to create a new directory for your web application. To do this, select the directory where you want to place the subdirectory, and click the Create New Folder icon (found just above the top-right corner of the directory tree). Either way, once you ve selected your directory, click Open. The Choose Location dialog box also has options (represented by the buttons on the left) for creating a web application on an IIS virtual directory or a remote web server. You can ignore these options for now. In general, it s easiest to develop your web application locally and upload the files once they are perfect.

Although the materials might be very good, keep in mind that most of these texts are meant to teach you how to do different individual tasks (for example, access a database) and not how to correctly create a flexible and scalable application..

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