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Override one of the render methods (Render(), RenderContents(), RenderBeginTag(), and so on) from the base control class. To override the method successfully, you need to specify the same access level as the original method (such as Public or Protected). Visual Studio helps you out on this account by warning you if you make a mistake. Use the MyBase keyword to call the base method. In other words, you want to make sure you re adding functionality to the method, not replacing it with your code. The original method may perform some required cleanup task that you aren t aware of, or it may raise an event that the web page could be listening for. Add the code to write out any additional HTML. Usually, this code uses the HtmlTextWriter class, which supplies a helpful Write() method for direct HTML output. The following is an example of a TextBox control that overrides the Render() method to add a title. The content for this title is taken from the custom Title property.

Public Class TitledTextBox Inherits System.Web.UI.WebControls.TextBox Private _title As String Public Property Title() As String Get Return _title End Get Set(ByVal value As String) _title = value End Set End Property Protected Overrides Sub Render(ByVal writer As HtmlTextWriter) ' Add new HTML. writer.Write("<h1>" & title & "</h1>") ' Call the base method (so that the text box is rendered). MyBase.Render(writer) End Sub End Class

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So why would you want to change the default behavior and use a DataReader to connect to the database The main reason is speed As you ve learned, the DataReader is the fastest way of talking to a database; a DataSet adds overhead If you re simply using a SqlDataSource to get a set of results from the database to display to the user, you should set the DataSourceMode property to SqlDataSourceModeDataReader You ve already looked at this use of the SqlDataSource in 3, when you populated the list box containing the list of Manufacturers in the database In that case, you just show this data to the user, so you should have used a DataReader For every other use of the SqlDataSource, you should leave the DataSourceMode as the default value of SqlDataSourceModeDataSet.

(causing less network traffic to happen) or letting ViewState be enabled but preventing further reprocessing of Page_Load during page postbacks (causing less database load when there are controls that work with the database). You can t apply both techniques, or you ll get empty controls when postback events occur. Which technique is best for a particular control depends on the specifics of the control.

Remember, ASP .NET creates a page by moving through the list of controls and instructing each one to render itself (by calling the Render() method). It collects the total HTML output and sends it as a complete page.

Note One limitation in this approach is that you aren t using the built-in style properties such as Font,

Although so far, you ve looked at only displaying data in a GridView from the SqlDataSource, it can do a lot more As you ll see in 9, a SqlDataSource in association with a GridView can allow paging, sorting, and filtering of the data that you ve retrieved A SqlDataSource can also allow the user to modify the data and have the changes propagated back to the underlying database In these cases, you need to access the data using a DataSet..

To see the encoded ViewState information for a page, you can do a simple test. Load BalloonShop in your web browser, right-click the page, and select View Source. Inside the page

ForeColor, BackColor, and so on. Although you can still set these properties for the TitledTextBox, they have no effect because your rendering code doesn t take them into account.

You can use a similar technique to add attributes to the HTML text box tag. For example, you might want to link a little JavaScript code to the OnBlur attribute to make a message box appear when the control loses focus. No TextBox property exposes this attribute, but you can add it manually in the AddAttributesToRender() method. The code you need is as follows:

Now that you have a rough idea of how a DataSet works, it s time to take a look at how it compares with a DataReader. The two have some obvious differences. Table 5-3 lists the differences you ve seen so far and a few related ones. You ll also see a comparison of the DataSet and DataReader objects at the end of 7, with respect to the theory and techniques you learn there. The intention is that by the end of 7, you ll be able to make a sound judgment as to which object should be used as the source of data for any ASP.NET pages you re writing.

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