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A well-built web application divides its work into discrete, independent blocks The more modular your web application is, the easier it is to maintain your code, troubleshoot problems, and reuse key bits of functionality Although it s easy enough to reuse code (you simply need to pull it out of your pages and put it into separate classes), it s not as straightforward to reuse web page markup You can cut and paste blocks of HTML and ASP NET control tags, but this causes endless headaches if you want to change your markup later Instead, you need a way to wrap up web page markup in a reusable package, just as you can wrap up ordinary C# code The trick is to create a user control User controls look pretty much the same as ASPNET web forms.

Like web forms, they are composed of a markup portion with HTML and control tags (the ascx file) and can optionally use a code-behind file with event-handling logic They can also include the same range of HTML content and ASP NET controls, and they experience the same events as the Page object (such as Load and PreRender) The only differences between user controls and web pages are as follows: User controls use the file extension ascx instead of aspx, and their code-behind files inherit from the SystemWebUIUserControl class In fact, the UserControl class and the Page class both inherit from the same base classes, which is why they share so many of the same methods and events, as shown in the inheritance diagram in Figure 12-1 The ascx file for a user control begins with a <%@ Control %> directive instead of a <%@ Page %> directive.

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procedure, the database will make an intelligent guess and check that what you re after is a stored procedure. If you re using parameters, you must set SelectCommandType to StoredProcedure.

The search index we build in this application is specifically geared toward blog posts. In a larger web application, you may have other content you want to index also. In that instance you may want to have one index for each type of data (then when a search is performed, you search each index), or you have one index containing all searchable data. Each of these methods has its own advantages and disadvantages. For example, if you use a single index for all types of data It is simpler to search across all indexes in one operation since all searchable data is in one place. You must keep track of the kind of data each document in the index is. For example, if you are indexing data about news articles as well as about uploaded files, you must differentiate between these somehow when you display search results to users. On the other hand, if you use one index for each type of data It is more difficult to search because you have to search every index when a search is performed. It gives you more leverage to create different types of searches on your site. For example, if you want a form to allow users to search only in uploaded files, then you simply search the corresponding index. If you also have an index that holds information about news articles, you can skip searching this completely. Ultimately it comes down to your own needs, depending on the type of application you are implementing and the search capabilities you need to provide.

User controls can t be requested directly by a web browser Instead, they must be embedded inside other web pages..

Being able to add stored procedures to your database is all well and good, but you also need some way of modifying or deleting them. You can accomplish both of these tasks using two other DDL commands. To modify a stored procedure, you use the ALTER PROCEDURE query, specifying the name of the stored procedure you want to modify as well as the complete new contents of the stored procedure, like so:

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