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Serialization is the process of taking an object that exists in-memory and converting that object into a format (usually binary data or XML) that can be stored out-of-memory in a file or a database. Deserialization is the process of taking that stored data and recreating the object inmemory. Interestingly enough, the Value column in the table you created to store configuration settings can store large amounts of textual data, and the .NET Framework has tools that help serialize in-memory objects into XML. This means that you can serialize entire objects and store them as configuration settings in a database. First, you need to create a generic function that can serialize an object into an XML representation. In this example, you will use the Simple Object Access Protocol (SOAP) XML formatter to handle the serialization details. Right-click on your web application icon in the Solution Explorer and select Add Reference. In the .NET tab, locate and select System.Runtime.Serialization.Formatters.Soap.dll from the list of components. Click the OK button and a reference to the assembly is added to your project. Then make sure you import the following namespaces at the top of the class file: Imports System.IO Imports System.Runtime.Serialization.Formatters.Soap After you have the imported the SOAP formatter assembly and added the appropriate Imports statements, then add this function to the DataConfig class: '*************************************************************************** Private Shared Function SerializeToXML(ByVal Obj As Object) As String Try Dim sf As New SoapFormatter() Dim ms As New MemoryStream sf.Serialize(ms, Obj) Dim ascEncoding As New System.Text.ASCIIEncoding() Return ascEncoding.GetString(ms.GetBuffer) Catch Return String.Empty End Try End Function

For example, many controls support styles that specify a range of formatting information. The data controls are one example, and the Calendar control provides another. Here s how you might define Calendar styles in a skin file to match your theme: <asp:Calendar ID="Calendar1" runat="server" BackColor="White" ForeColor="Black" BorderColor="Black" BorderStyle="Solid" CellSpacing="1" Font-Names="Verdana" Font-Size="9pt" Height="250px" Width="500px" NextPrevFormat="ShortMonth" SelectionMode="Day"> <SelectedDayStyle BackColor="DarkOrange" ForeColor="White" /> <DayStyle BackColor="Orange" Font-Bold="True" ForeColor="White" /> <NextPrevStyle Font-Bold="True" Font-Size="8pt" ForeColor="White" /> <DayHeaderStyle Font-Bold="True" Font-Size="8pt" ForeColor="#333333" Height="8pt" /> <TitleStyle BackColor="Firebrick" BorderStyle="None" Font-Bold="True" Font-Size="12pt" ForeColor="White" Height="12pt" /> <OtherMonthDayStyle BackColor="NavajoWhite" Font-Bold="False" ForeColor="DarkGray" /> </asp:Calendar> This skin defines the font, colors, and styles of the Calendar. It also sets the selection mode, the formatting of the month navigation links, and the overall size of the calendar. As a result, all you need to use this formatted calendar is the following streamlined tag: <asp:Calendar ID="Calendar1" runat="server" />

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Figure 15-6 shows how this Calendar control would ordinarily look and how it looks when the page uses the corresponding theme.

page. In the next chapter, we discuss how to take advantage of state management in server controls, but first, we provide a quick introduction to the new AJAX functionality first available in ASP.NET 3.0 and enhanced in ASP.NET 3.5.

The SerializeToXML function accepts a single object as a parameter It then creates a SoapFormatter object, which is responsible for converting an object into an XML representation The Serialize function of the SoapFormatter object accepts two parameters: the object that is to be converted and the stream to which the XML data is written In this case, the stream is stored in memory and not in a file The memory stream holds the XML as a giant byte array, so the ASCII encoding object converts that byte array into a string, which is then returned from the function If any error occurs during this function, an empty string is returned Now that you can convert an object into XML, you need a way to convert it back.

Caution When you create skins that specify details such as sizing, be careful. When these settings are applied to a page, they could cause the layout to change with unintended consequences. If you re in doubt, set a SkinID so that the skin is applied only if the control specifically opts in.

Another powerful technique is to reuse images by making them part of your theme. For example, imagine you perfect an image that you want to use for OK buttons throughout your website and you have another image for all the cancel buttons. The first step in implementing this design is to add the images to your theme folder. For the best organization, it makes sense to create one or more subfolders just for holding images. In Figure 15-7, the images are stored in a folder named ButtonImages.

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