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HTML code, you can see the ViewState information encoded as a hidden form element named __VIEWSTATE: <input type="hidden" name="__VIEWSTATE" value="dDwyMTAxNDE4MzM3O3Q8O2w8aTwxPjs+O2w8dDw7bDxpPDE+O2k8Mz47aTwxMT47PjtsPHQ8O2 w8aTwwPjs+O2w8dDxAMDxwPHA8bDxTZWxlY3RlZEluZGV4O0RhdGFLZXlzO ............" />

Public Class LostFocusTextBox Inherits System.Web.UI.WebControls.TextBox Protected Overrides Sub AddAttributesToRender( _ ByVal writer As HtmlTextWriter) MyBase.AddAttributesToRender(writer) writer.AddAttribute("onBlur", _ "javascript:alert('You Lost Focus')") End Sub End Class

The resulting HTML for the LostFocusTextBox looks something like this:

A DataReader is specific to a data provider (for example, SqlDataReader, OdbcDataReader, and OleDbDataReader).

Figure 25-12 shows what happens when the text box loses focus. You can extend the usefulness of this control by making the alert message configurable, as shown here:

Note The value of the ViewState is not in human-readable form, but it isn t encrypted either. The information is stored as name-value pairs using the System.Web.UI.StateBag object. The simplest way to decipher the value stored in your ViewState is by going to a web site such as http://www.wilsondotnet.com/ Demos/ViewState.aspx, which reveals what the ViewState string actually contains.

Public Class LostFocusTextBox Inherits System.Web.UI.WebControls.TextBox Private _alert As String Public Property Alert() As String Get Return _alert End Get Set(ByVal value As String) _alert = value End Set End Property Protected Overrides Sub AddAttributesToRender( _ ByVal writer As HtmlTextWriter) MyBase.AddAttributesToRender(writer) writer.AddAttribute("OnBlur", _ "javascript:alert('" & alert & "')") End Sub End Class

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The DataSet class isn t a part of any data provider. It s specific to .NET only. However, the DataAdapter used to fill the DataSet with Fill() is specific to a data provider (for example, SqlDataAdapter, OdbcDataAdapter, and OleDbDataAdapter). The data retrieved through a DataSet is read-write. You can work with data in a DataSet in any order you choose as many times as you like.

Once you start experimenting with altering the TextBox control s HTML, you might wonder whether you could render the entire content of a control by hand, by writing HTML. Once you deal with raw HTML, there s nothing you can t do. You no longer need to find a similar control to inherit from instead, you can generate exactly what you want (although a detailed visual appearance will obviously take a fair bit of work). Rendering a control from scratch is an easy task in ASP.NET all you need to do is inherit from the System.Web.UI.WebControls.WebControl class, which is the base of all ASP .NET web controls. Figure 25-13 shows the inheritance hierarchy for web controls.

In the BalloonShop web site, you re mainly concerned about the ViewState for ProductsList.ascx, which can get quite large for a lot of products. The total page ViewState has close to 2KB if the page has six products, and less than 1KB if no products are displayed on the page. The professional way to view how much space the ViewState occupies for every element on the page is to enable page tracing by opening a Web Form and modifying its Page directive. Update Default.aspx like this: <%@ Page Trace="true" Language="C#" MasterPageFile="~/BalloonShop.master" CompileWith="Default.aspx.cs" ClassName="Default_aspx" Title="Untitled Page" %> After making this change, load Default.aspx and look at the tracing information appended at the bottom of the page. You can see a lot of info about your page, including the ViewState size for every control.

Note Technically, you can inherit from the base System.Web.UI.Control class instead, but it provides

The data retrieved through a DataReader is read-only. The data retrieved through a DataReader is forward-only. Once the data has been cycled through, the DataReader must be closed and re-created in order to reaccess the data. A DataReader presents data through a direct connection to the data source. Only one row of data is stored in memory at any one time. A DataReader takes up few IIS and memory resources but annexes the database connection until it s closed. A DataReader lasts as long as the connection to the database is open. It can t be persisted in a cookie or a session variable. Columns in a DataReader are referenced by index or name. A DataReader has no concept of primary keys, constraints, views, or any other relational database management system concepts, except rows and columns. You can t update a data source through a DataReader. A DataReader connects to only one data source.

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