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The first parameter identifies the DataSet you re working with, the second is the index number of the row in the results of the SelectCommand to start filling with, and the third is the number of rows (with 0 meaning all), to add to the DataTable, which is identified by the fourth parameter // fill the DataTable ManufacturerAdapterFill(dset, 2, 0, "Manufacturer"); } Note that the SelectCommand still retrieves all the rows from the Manufacturer table, even though you don't use the first two If you wanted to retrieve only the seven rows required, you would need to alter the SELECT query rather than use this variant of Fill()..

Figure 25-10 contrasts two Calendar controls: the normal one and the custom FormattedCalendar control class.

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HTTP (Hypertext Transfer Protocol) is a stateless protocol the server doesn t retain any information about the previous client request. Without an additional mechanism over this protocol, the server can t retain the state of a simple HTML page between client requests (for example, which check boxes or radio buttons are selected, and so on). ASP.NET has a built-in technique for dealing with this problem. When sending the HTML response to the client, by default ASP.NET encodes the current state of every control in a string called ViewState, in the form of a hidden form field called __VEWSTATE. ViewState is used to maintain the state of the web page during client postbacks. In other words, when the visitor performs any action that triggers a postback event, the page maintains its state after the event handler method executes at the server. For this reason, in the previous exercise, you modified DepartmentsList.ascx.cs and the other controls and pages to first verify whether the control is being loaded as a result of a client postback. If it is, you don t need to query the database again, because its state is maintained by the ViewState mechanism. The problem with ViewState is that it s transferred between the client and the server on every request. With pages that contain a large number of controls, the ViewState information can grow significantly, causing a lot of network traffic. The ViewState information can be disabled for an entire page, or for just specific controls on a page. However, when disabling ViewState for a control, you need to fill it with data even during postback events; otherwise, its contents would disappear.

Even though you set these defaults in the custom class code, this doesn t prevent you from modifying Tip them in your web page code. The constructor code runs when the Calendar control is created, after which the control tag settings are applied. Finally, the event handling code in your web page also has the chance to modify the FormattedCalendar properties.

You can also subclass a control and add low-level refinements by manually configuring the HTML that is generated from the control. To do this, you need to follow only a few basic guidelines:

As you ve seen in this chapter, you have two ways to access data in the database: As a DataReader, allowing forward-only access to the data As a DataSet, allowing full control over the disconnected data This still doesn t explain how the SqlDataSource accesses the database Does it do it using a DataReader or a DataSet Well, actually, it can do both! By default, the SqlDataSource connects to the database and stores the data internally as a disconnected DataSet However, you can tell the SqlDataSource to access the database using a DataReader by setting its DataSourceMode property, which has two possible values: DataReader: Retrieves data from the database using a DataReader The type of DataReader (SqlDataReader, OleDbDataReader, or OdbcDataReader) is determined from the connection used for the SqlDataSource DataSet: Retrieves the data from the database into a DataSet This is the default value.

Note So, if you want to speed up a user control, you mainly have to choose between disabling its ViewState

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