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.NET 2.0 adds built-in support for compressing data in any stream. This trick allows you to compress data that you write to any file. The support comes from two classes in the new System.IO.Compression namespace: GZipStream and DeflateStream. Both of these classes represent similarly efficient lossless compression algorithms. To use compression, you need to wrap the real stream with one of the compression streams. For example, you could wrap a FileStream (for compressing data as it s written to disk) or a MemoryStream (for compressing data in memory). Using a MemoryStream, you could compress data before storing it in a binary field in a database or sending it to a web service. For example, imagine you want to compress data saved to a file. First, you create the FileStream: FileStream fileStream = new FileStream(@"c:\myfile.txt", FileMode.Create); Next, you create a GZipStream or DeflateStream, passing in the FileStream and a CompressionMode value that indicates whether you are compressing or decompressing data: GZipStream compressStream = new GZipStream(fileStream, CompressionMode.Compress); To write your actual data, you use the Write() method of the compression stream, not the FileStream. The compression stream compresses the data and then passes the compressed data to the underlying FileStream. If you want to use a higher-level writer, such as the StreamWriter or BinaryWriter, you supply the compression stream instead of the FileStream: StreamWriter w = new StreamWriter(compressStream);

To implement your formatting properties, ASPNET will frequently render inline style rules In addition, if you ve crafted the perfect stylesheet, you can still use it It s up to you whether you want to use one or both solutions As you ll see later in this chapter (in the section Using CSS in a Theme ), it s possible to use a stylesheet as part of a theme..

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If your user control contains input controls, it s difficult to use caching. The problem occurs if the content in the input controls affects the cached content that the user control displays. With ordinary caching, you re stuck reusing the same copy of the user control, regardless what the user types into an input control. (A similar problem exists with web pages, which is why it seldom makes sense to cache a web page that includes input controls.) The VaryByControl property solves this problem. VaryByControl takes a semicolon-delimited string of control names that are used to vary the cached content in much the same way that VaryByParameter varies the cached content for query string values.

Now you can perform your writing through the writer object. When you re finished, flush the GZipStream so that all the data ends up in the file: w.Flush(); fileStream.Close(); Reading a file is just as straightforward. The difference is that you create a compression stream with the CompressionMode.Decompress option, as shown here: FileStream fileStream = new FileStream(@"c:\myfile.bin", FileMode.Open); GZipStream decompressStream = new GZipStream(fileStream, CompressionMode.Decompress); StreamReader r = new StreamReader(decompressStream);

Microsoft includes the OLE DB provider with ADO.NET so that you can use your existing OLE DB drivers. However, if you can find a provider that s customized specifically for your data source, you should use it instead. For example, you can connect to a SQL Server database using either the SQL Server provider or the OLE DB provider, but the SQL Server provider will always perform best.

For example, consider the following user control: <%@ Control Language="C#" AutoEventWireup="true" CodeFile="VaryByControl.ascx.cs" Inherits="VaryByControl" %> <asp:DropDownList id="lstMode" runat="server" Width="187px"> <asp:ListItem>Large</asp:ListItem> <asp:ListItem>Small</asp:ListItem> <asp:ListItem>Medium</asp:ListItem> </asp:DropDownList> <br /> <asp:button ID="Button1" text="Submit" OnClick="SubmitBtn_Click" runat=server/> <br /><br /> Control generated at:<br /> <asp:label id="TimeMsg" runat="server" /> When the button is clicked, it displays the current date in one of three formats. protected void Page_Load(object sender, EventArgs e) { switch (lstMode.SelectedIndex) { case 0: TimeMsg.Font.Size = FontUnit.Large; break; case 1: TimeMsg.Font.Size = FontUnit.Small; break; case 2: TimeMsg.Font.Size = FontUnit.Medium; break; } TimeMsg.Text = DateTime.Now.ToString("F"); } It s not sufficient to keep one cached copy of this page, because the display format changes depending on the selection in the lstMode control (see Figure 14-9).

Note Although GZIP is a industry-standard compression algorithm (see http://www.gzip.org for information), that doesn t mean you can use third-party tools to decompress the compressed files you create. The problem is that although the compression algorithm may be the same, the file format is not. Namely, the files you create won t have header information that identifies the original compressed file.

At first glance, it might seem that ADO.NET offers a fragmented model, because it doesn t include a generic set of objects that can work with multiple types of databases. As a result, if you change from one RDBMS to another, you ll need to modify your data access code to use a different set of classes. But even though different .NET data providers use different classes, all providers are standardized in the same way. More specifically, each provider is based on the same set of interfaces and base classes. For example, every Connection object implements the IDbConnection interface, which defines core methods such as Open() and Close(). This standardization guarantees that every Connection class will work in the same way and expose the same set of core properties and methods. Behind the scenes, different providers use completely different low-level calls and APIs. For example, the SQL Server provider uses the proprietary TDS (Tabular Data Stream) protocol to communicate with the server. The benefits of this model aren t immediately obvious, but they are significant:

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