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The next chapter looms, but before you start putting data on the screen, let s quickly recap some useful coding tips covered in this chapter. Query only for the information you want to use. For example, don t query for three columns per row if you re using only two. Likewise, use a WHERE clause in a SELECT query to retrieve only the rows of information that are required, rather than every row in the database. If you re using a DataReader, make sure you close it with Close() as soon as you can. Similarly, make sure you use Close() for your Connection as well. Use the DataReader s HasRows and IsDBNull properties to avoid any unwanted error messages when working with data. If you re using a DataSet, be aware of how calling Fill() will work with the DataSet you re using. Will it create new columns in a DataTable or use the other ones there Make sure the columns you re querying for in the database match those in the DataTable you re targeting. Don t forget that primary keys and relationships in a DataSet won t be copied over from a database. You must create them in code.

1. Open ProductsList.ascx in Design View, select the DataList, and open its Properties window by pressing F4. 2. Set the EnableViewState property to False, as shown in Figure 6-1.

Currently, the repeater control provides an EnableViewState property (which is inherited from the WebControl class), but it doesn t actually abide by it. You can test this by creating a simple page with two buttons (see Figure 25-15). One button changes the RepeatTimes to 5, while the other button simply triggers a postback. You ll find that every time you click the Postback button, RepeatTimes is reset to the default of 3. If you change the Text property in your code, you ll also find that it reverts to the value specified in the control tag.

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Figure 25-15. Testing view state This problem has an easy solution: store the value in the control s view state. As with web pages, the values in the member variables in a custom web control class are automatically abandoned after the page is returned to the client. Here s a rewritten control that uses a variable stored in view state instead of a member variable:

Summary

Public Class ConfigurableRepeater Inherits System.Web.UI.WebControls.WebControl Public Sub New() RepeatTimes = 3 Text = "Text" End Sub Public Property RepeatTimes() As Integer Get Return CType(ViewState("RepeatTimes"), Integer) End Get Set(ByVal Value As Integer) ViewState("RepeatTimes") = Value End Set End Property Public Property Text() As String Get Return CType(ViewState("Text"), String)

Now you have disabled ViewState for some of your controls. For your particular solutions, you ll decide for which controls it s best to disable ViewState. So far, you ve learned about letting ASP.NET manage the state of your controls, in which case you don t reload the controls with data from the database (by verifying the IsPostBack value), like you did with DepartmentsList. ascx. You also learned how to disable the ViewState information, in which case you rely on the control reading the database on every request. Most of the time, you must not apply both techniques because you risk ending up with empty controls when client postbacks occur, because the data isn t gathered from the database or from the ViewState. So far, your client s web site is an exception to that rule, however, because the only occasion (until now) in which a client postback occurs is in the SearchBox control, at which time the page is redirected (and so reloaded) anyway. Still, for a quick test, you can now disable ViewState for DepartmentsList.ascx, add a button somewhere in Default.aspx, and double-click it (in Design View) to create its Click event handler. Execute the page, and click the button. The list of departments should disappear because its ViewState is not maintained, and it s not populated from the database, either.

End Get Set(ByVal Value As String) ViewState("Text") = Value End Set End Property Protected Overrides Sub RenderContents(ByVal writer As HtmlTextWriter) MyBase.RenderContents(writer) Dim i As Integer For i = 1 To RepeatTimes writer.Write(Text & "<br />") Next End Sub End Class

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