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The Deserialize function takes care of this task: '*************************************************************************** Private Shared Function DeserializeFromXML(ByVal XML As String) As Object Try Dim ascEncoding As New SystemTextASCIIEncoding() Dim ms As New MemoryStream(ascEncodingGetBytes(XML)) Dim sf As New SoapFormatter Return sfDeserialize(ms) Catch Return Nothing End Try End Function The Deserialize function accepts a string containing the XML representation of an object It then converts that string into a byte array using the ASCIIEncoding object and creates a new memory stream from it That memory stream is then passed into the Deserialize function of the SoapFormatter and the object represented by the XML is reconstructed and returned as an Object You need to cast it to the appropriate type when you use this function, as shown in the following example If an error occurs during processing, then Nothing is returned.

ASP.NET AJAX 1.0 released after .NET Framework 2.0 as an officially supported product that installs on top of .NET Framework 2.0. ASP.NET AJAX 1.0 provides a set of technologies to add AJAX (Asynchronous JavaScript and XML) support to ASP.NET 2.0. It consists of a client-side script framework and server controls, as well as the underlying plumbing for the AJAX functionality with ASP.NET. In addition to the ASP.NET AJAX 1.0 release, the ASP.NET AJAX Control Toolkit released as a shared-source implementation built on top of the ASP.NET AJAX Extensions 1.0 core functionality.

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Now you need to create the skins that use these images. In this case, both of these tags should be named skins. That s because you re defining a specific type of standardized button that should be available to the page when needed. You aren t defining a default style that should apply to all buttons. <asp:ImageButton runat="server" SkinID="OKButton" ImageUrl="ButtonImages/buttonOK.jpg" /> <asp:ImageButton runat="server" SkinID="CancelButton" ImageUrl="ButtonImages/buttonCancel.jpg" /> When you add a reference to an image in a skin file, always make sure the image URL is relative to the theme folder, not the folder where the page is stored. When this theme is applied to a control, ASP .NET automatically inserts the Themes\ThemeName portion at the beginning of the URL. Now to apply these images, simply create an ImageButton in your web page that references the corresponding skin name: <asp:ImageButton ID="ImageButton1" runat="server" SkinID="OKButton" /> <asp:ImageButton ID="ImageButton2" runat="server" SkinID="CancelButton" /> You can use the same technique to create skins for other controls that use images. For example, you can standardize the node pictures used in a TreeView, the bullet image used for the BulletList control, or the icons used in a DataGridView.

ASP .NET also gives you the ability to use a stylesheet as part of a theme. You might use this feature for a few reasons: You want to style HTML elements that might not correspond to server controls. You prefer to use a stylesheet because it is more standardized or because it can also be used to format static HTML pages. You have already invested effort in creating a stylesheet, and you don t want to create themes to implement the same formatting. To use a stylesheet in a theme, you first need to add the stylesheet to your theme folder. ASP .NET searches this folder for all .css files and dynamically binds them to any page that uses the theme. This has one catch, however. To bind the page to the stylesheet, ASP .NET needs to be able to insert a <link> tag in the <head> section of the web page. This is possible only if the <head> tag has the runat="server" attribute. This turns the <head> element into a server-side control that ASP .NET can modify to insert the stylesheet links. <head runat="server"> <title>...</title> </head> Once this is in place, you simply need to set the Theme attribute of the page to gain access to the stylesheet rules. You can then set the CssClass property of the controls you want to format, as you saw earlier in the chapter. Any style rules that are linked directly to HTML tags are applied automatically. You can use as many stylesheets as you want in a theme. ASP.NET will add multiple <link> tags, one for each stylesheet in the theme. You can include more than one cascading stylesheet in a theme. If you add multiple cascading stylesheets, then the server-side <head runat="Server"/> tag will automatically generate links for each stylesheet.

Armed with the ability to serialize and deserialize objects, you can now implement the MyPrimeList property, which serializes and deserializes an entire ArrayList to and from the database: '*************************************************************************** Public Shared Property MyPrimeList() As ArrayList Get If _MyPrimeList Is Nothing Then Dim XML As String = ReadValueFromDatabase("MyPrimeList") If Not XML = StringEmpty Then _MyPrimeList = CType(DeserializeFromXML(XML), ArrayList) End If End If If _MyPrimeList Is Nothing Then _MyPrimeList = New ArrayList() Return _MyPrimeList End Get Set(ByVal value As ArrayList) _MyPrimeList = value SaveMyPrimeList() End Set End Property.

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