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ASP.NET provides access to a variety of client-side state management techniques to give you a helping hand in building useful, interactive web sites. Control developers can leverage these state management features to provide extra value in their controls by making it look as if the controls can remember their previous values or obviate the need to go back to a data source to display information for tabular controls. What makes this capability wonderful is that these options do not require any special-purpose mechanism on the web server; instead, they use the everyday features of a web browser to make this magic happen. In this section, we provide an overview of the client-side state options that are available: URL strings Cookies Hidden HTML variables View state

Acquiring a connection takes a short, but definite, amount of time. In a web application in which requests are being handled efficiently, connections will be opened and closed endlessly as new requests are processed. In this environment, the small overhead required to establish a connection can become significant and limit the scalability of the system. One solution is connection pooling. Connection pooling is the practice of keeping a permanent set of open database connections to be shared by sessions that use the same data source. This avoids the need to create and destroy connections all the time. Connection pools in ADO.NET are completely transparent to the programmer, and your data access code doesn t need to be altered. When a client requests a connection by calling Open(), it s served directly from the available pool, rather than re-created. When a client releases a connection by calling Close() or Dispose(), it s not discarded but returned to the pool to serve the next request.

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Figure 12-11. Denying a single computer by IP address You can specify a range of computers by selecting the Group of computers option button and entering an IP address and a subnet mask as shown in Figure 12-12 (for example, 192.168.75.0 as the IP address and 255.255.255.0 as the subnet mask will include all machines that have an IP address in the range 192.168.75.0 to 192.168.75.255).

HeaderTemplate SideBarTemplate StartNavigationTemplate StepNavigationTemplate FinishNavigationTemplate

Encoding information in the URL string passed to the web server is one of the simplest and most widely used techniques for storing client state. A great example is your favorite e-commerce store that puts the category and product-identifying information in a list of hyperlinks for the rows of products that fit a category. The embedded information in the URL allows the web site to remember what category the user came from when choosing to follow a link for a particular product. Developers can also add nonnavigational information at the end of the URL string by just appending another variable, to track such information as the customer s buying history with the web site to provide a discount, for example: http://acme.com/product.aspx categoryid=1&productid=1&custtype=preferred ASP.NET parses the URL string that it receives as part of the page request and provides easy access to the key/value pairs through two properties of the HttpRequest class: QueryString and Params. HttpRequest itself is available through the Request property of the Context object. The following code snippet shows how either the QueryString or Params collection can read the incoming product.aspx URL string for category and custom information: string categoryID = Request.QueryString["categoryid"]; string productID = Request.Params["productid"]; string custType = Request.Querystring["custtype"]; Adding extra variables or removing variables from the URL string in maintaining an application is something that the programmer must do manually. Forgetting to add variables or neglecting to modify all hyperlinks on a web form is a common mistake. Finally, URL strings have size limitations that vary among browser devices, so developers must take a one-size-fitsall approach when attempting to store state in the URL string.

Defines the content of the header region Defines the sidebar, which typically includes navigation links for each step Defines the navigation buttons for the first step (when StepType is Start) Defines the navigation buttons for intermediate steps (when StepType is Step) Defines the navigation buttons for the final step (when StepType is Finish)

Figure 12-12. Denying a group of computer by entering an IP address and subnet mask Or you can specify a domain name as shown in Figure 12-13.

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