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State management is a necessary evil. By enabling it, you charge your application with an extra burden. To reduce the performance impact of session state on Web applications, the first guideline is to disable session state whenever possible. However, to prevent the session from expiring, the HTTP module still marks the session as active in the data store. For out-of-process state servers, this means that a roundtrip is made. Using a custom session ID manager returning a null session ID for requests that are known not to require session state is the best way to work around this issue and avoid the overhead entirely. (Write a class that inherits from SessionIDManager and overrides GetSessionID.) The second guideline entails minimizing contention on session data by avoiding frames and downloadable resources served by session-enabled handlers. The third guideline relates to data serialization and deserialization. You should always use simple types and break complex classes into arrays of simple properties, at least as far as session management is concerned. In other words, I m not suggesting that you should factor out your DAL classes just change the way you serialize them into the session store. An alternate approach entails building a custom serialization algorithm that is optimized for session state storage. Breaking a class into various properties, with each stored in a session slot, is advantageous because of the simple types being used, but also because the extreme granularity of the solution minimizes the data to save in case of changes. If one property changes, only one slot with a simple type is updated instead of a single slot with a complex type.

Try Open the file. fs = New FileStream(filename, FileMode.Open) Create a CryptoStream that just evaluates the hash value. cs = New CryptoStream(New NullStream, keyhash, CryptoStreamMode.Write) The number of bytes in the file excluding hash at the end Dim bytesToRead As Integer = CInt(fs.Length) - keyhash.HashSize \ 8 Read the file contents while evaluating its hash code.

Corruption in the leaf level of a critical system catalog clustered index Corruption in a PFS page header Data purity errors (error 2570) Errors from system catalog cross-checks (error 8992)

DataList1.ItemTemplate = Me.LoadTemplate( blue_on_orange.ascx ) DataList1.AlternatingItemTemplate = Me.LoadTemplate( blue_on_white.ascx ) DataList1.DataBind()

pan.Controls.Add(New LiteralControl( </b> - ))

4. VIA The VIA Properties dialog box can be used to enable or disable the VIA protocol as well as set the following parameter values:

TABLE 3-9

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In the TrainGame example, you created a user control with events. When you dragged the Train control onto the form, the events were available in the Method Name list for Visual Basic projects and in the Properties window for Visual C# projects. You don t have to use the designer to connect your event methods to your class instances; you can do it simply by using code statements. Setting up event methods in code allows you to Create control instances at run time and respond to their events Change the event handler for a particular event at run time In Visual Basic, you can choose from two ways to set up event methods. One way uses the Handles keyword. The other way uses the AddHandler statement. To use the Handles keyword, you must declare the instance with the WithEvents keyword as a field of a class. The catch is that you can t use the New keyword in the declaration, so the class must be instantiated elsewhere in the class, most likely in the constructor. Once you declare the class using the WithEvents keyword, the events become available for the instance in the Method Name list of the code editor, which is the method used by the

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aPersonObject.FirstName = Joe"

The RequiredFieldValidator control is the simplest of the group; you just assign the name of the control that must contain a value to its ControlToValidate property and set a suitable error message:

USE MyDatabase; SELECT * FROM dbo.MyRequestQueue WITH (NOLOCK);

When you issue a Cross Certification Authority certificate, you can configure a Policy.inf file to specify which application policy OIDs are permitted in partner-issued certificates. Likewise, you can define a CAPolicy.inf file to specify which application policy OIDs are permitted in root certification authority certificates. To configure application policies in a Policy.inf or CAPolicy.inf file, create the following sections:

The Windows operating system comes in several variants, each targeted towards a particular size and type of business. Understanding and determining the most appropriate one for your SQL Server 2005 deployment is almost as important as selecting the correct edition of SQL Server 2005. SQL Server 2005 can be installed and run on Windows 2000, Windows 2003, and Windows XP. These three operating systems are described briefly in the following list:

Creating a cube by using a wizard template is remarkably quick, but before you begin you need to make a few preparations.

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This report includes both a chart and a matrix. When rendered as HTML, the size of the Web page expands horizontally and vertically to accommodate the contents. However, the chart and the matrix won t fit a printed page if the report is designed incorrectly. Click TIFF File in the Export list box, click the Export link, and then click the Open button in the File Download dialog box. Your default viewer for TIFF files might be different, but the resulting image looks like this:

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