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Insert("Employees", ds, empDependency); You also need to call the static SqlDependencyStart() to initialize the listening service on the web server This needs to be performed only once for each database connection One place you can call the Start() method is in the Application_Start() method of the globalasax file SqlDependencyStart(); This method opens a new, nonpooled connection to the database ASPNET checks the queue for notifications using this connection The first time you call Start(), a new queue is created with a unique, automatically generated name, and a new notification service is created for that queue Then, the listening begins When a notification is received, the web server pulls it from the queue, raises the SqlDependencyOnChange event, and invalidates the cached item Even if you have dependencies on several different tables, the same queue is used for all of them.

The information is session state is very secure, because it is stored exclusively on the server However, the cookie with the session ID can easily become compromised This means an eavesdropper could steal the cookie and assume the session on another computer Several workarounds address this problem One common approach is to use a custom session module that checks for changes in the client s IP address (see http://msdnmicrosoftcom/msdnmag/ issues/04/08/WickedCode for a sample implementation) However, the only truly secure approach is to restrict session cookies to portions of your website that use SSL That way, the session cookie is encrypted and useless on other computers If you choose to use this approach, it also makes sense to mark the session cookie as a secure cookie so that it will be sent only over SSL connections.

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What if you want to create an XmlDocument and fill it based on XML content you ve drawn from another source, such as a field in a database table In this case, instead of using the Load() method, you would use LoadXml(), which accepts a string that contains the content of the XML document.

That means you need only a single call to SqlDependencyStart() If you inadvertently call the Start() method more than once, nothing happens Finally, you can use the following code to detach the listener: SqlDependencyStop(); Typically, you ll use this when the Application_End() method is called to detach the listener and release all resources..

That prevents the user from changing the URL from https:// to http://, which would send the cookie without SSL Here s the code you need: RequestCookies("ASPNET_SessionId")Secure = True Typically, you ll use this code immediately after the user is authenticated Make sure at least one piece of information appears in session state so the session isn t abandoned (and then re-created later) Another related security risk exists with cookieless sessions Even if the session ID is encrypted, a clever user could use a social-engineering attack to trick a user into joining a specific session All the malicious user needs to do is feed the user a URL with a valid session ID When the user clicks the link, they join that session.

The interesting part is the GetChildNodesDescr() method. It first creates a string with three spaces for each indentation level that it will later use as a prefix for each line added to the final HTML text. private string GetChildNodesDescr(XmlNodeList nodeList, int level) { string indent = ""; for (int i=0; i<level; i++) indent += "     "; ... Next, the GetChildNodesDescr() method cycles through all the child nodes of the XmlNodeList. For the first call, these nodes include the XML declaration, the comment, and the <DvdList> element. An XmlNode object exposes properties such as NodeType, which identifies the type of item (for example, Comment, Element, Attribute, CDATA, Text, EndElement, Name, and Value). The code checks for node types that are relevant in this example and adds that information to the string, as shown here: ... StringBuilder str = new StringBuilder(""); foreach (XmlNode node in nodeList) { switch(node.NodeType) { case XmlNodeType.XmlDeclaration: str.Append("XML Declaration: <b>");

Custom cookies provide another way you can store information for later use. Cookies are small files that are created on the client s hard drive (or, if they re temporary, in the web browser s memory). One advantage of cookies is that they work transparently without the user being aware that information needs to be stored. They also can be easily used by any page in your application and even retained between visits, which allows for truly long-term storage. They suffer from some of the same drawbacks that affect query strings. Namely, they re limited to simple string information, and they re easily accessible and readable if the user finds and opens the corresponding file. These factors make them a poor choice for complex or private information or large amounts of data. Some users disable cookies on their browsers, which will cause problems for web applications that require them. For the most part, cookies are widely adopted because so many sites use them. However, they can limit your potential audience, and they aren t suited for the embedded browsers used with mobile devices.

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