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Data source controls turn up in the .aspx markup portion of your web page like ordinary controls. Here s an example: <asp:SqlDataSource ID="SqlDataSource1" runat="server" ... /> The SqlDataSource represents a database connection that uses an ADO.NET provider. However, this has a catch. The SqlDataSource needs a generic way to create the Connection, Command, and DataReader objects it requires. The only way this is possible is if your data provider includes a data provider factory, as discussed in 7. The factory has the responsibility of creating the provider-specific objects that the SqlDataSource needs in order to access the data source. As you know, .NET ships with these four provider factories: System.Data.SqlClient System.Data.OracleClient System.Data.OleDb System.Data.Odbc These are registered in the machine.config file, and as a result you can use any of them with the SqlDataSource. You choose a data source by setting the provider name. Here s a SqlDataSource that connects to a SQL Server database: <asp:SqlDataSource ProviderName="System.Data.SqlClient" ... /> The next step is to supply the required connection string without it, you cannot make any connections. Although you can hard-code the connection string directly in the SqlDataSource tag, you should always place it in the <connectionStrings> section of the web.config file to guarantee greater flexibility and ensure you won t inadvertently change the connection string, which minimizes the effectiveness of connection pooling. For example, if you create this connection string: <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> <connectionStrings> <add name="Northwind" connectionString="Data Source=localhost;Initial Catalog=Northwind; Integrated Security=SSPI"/> </connectionStrings> ... </configuration> you would specify it in the SqlDataSource using a $ expression like this: <asp:SqlDataSource ConnectionString="<%$ ConnectionStrings:Northwind %>" ... /> Once you ve specified the provider name and connection string, the next step is to add the query logic that the SqlDataSource will use when it connects to the database.

Cookies are retrieved by cookie name using the Request.Cookies collection, as shown here: HttpCookie cookie = Request.Cookies["Preferences"]; // Check to see if a cookie was found with this name. // This is a good precaution to take, // because the user could disable cookies, // in which case the cookie will not exist. string language; if (cookie != null) { language = cookie["LanguagePref"]; } The only way to remove a cookie is by replacing it with a cookie that has an expiration date that has already passed. The following code demonstrates this technique: HttpCookie cookie = new HttpCookie("LanguagePref"); cookie.Expires = DateTime.Now.AddDays(-1); Response.Cookies.Add(cookie);

The following variables are set by the shell:

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Writing HTTP Middleware 174 MiddlewareClassprocess_request(self, request) 174 MiddlewareClassprocess_view(self, request, view, args, kwargs) 174 MiddlewareClassprocess_response(self, request, response) 175 MiddlewareClassprocess_exception(self, request, exception) 175 Deciding Between Middleware and View Decorators 176 HTTP-Related Signals 178 djangocoresignalsrequest_started 178 djangocoresignalsrequest_finished 178 djangocoresignalsgot_request_exception 178 Applied Techniques 178 Signing and Validating Cookies 179 Now What 181.

You ll find that some other ASP.NET features use cookies. Two examples are session state (which allows you to temporarily store user-specific information in server memory) and forms security (which allows you to restrict portions of a website and force users to access it through a login page).

Session state is the heavyweight of state management. It allows information to be stored in one page and accessed in another, and it supports any type of object, including your own custom data types. Best of all, session state uses the same collection syntax as view state. The only difference is the name of the built-in page property, which is Session. Every client that accesses the application has a different session and a distinct collection of information. Session state is ideal for storing information such as the items in the current user s shopping basket when the user browses from one page to another. But session state doesn t come for free. Though it solves many of the problems associated with other forms of state management, it forces the web server to store additional information in memory. This extra memory requirement, even if it is small, can quickly grow to performance-destroying levels as hundreds or thousands of clients access the site.

Session management is not part of the HTTP standard. As a result, ASP.NET needs to do some extra work to track session information and bind it to the appropriate response. ASP.NET tracks each session using a unique 120-bit identifier. ASP.NET uses a proprietary algorithm to generate this value, thereby guaranteeing (statistically speaking) that the number is unique and that it s random enough so a malicious user can t reverse-engineer or guess what session ID a given client will be using. This ID is the only piece of information that is transmitted between the web server and the client. When the client presents the session ID, ASP .NET looks up the corresponding session, retrieves the serialized data from the state server, converts it to live objects, and places these objects into a special collection so they can be accessed in code. This process takes place automatically.

Every time you make a new request, ASP.NET generates a new session ID until you actually use session state to store some information. This behavior achieves a slight performance enhancement in short, why bother to save the session ID if it s not being used

Backend Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183

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