create barcode bitmap c# Configuring the StateServer Provider in C#

Creating Quick Response Code in C# Configuring the StateServer Provider

Configuring the StateServer Provider
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Using out-of-process storage scenarios, you give the session state a longer life and your application greater robustness. Out-of-process session-state storage basically protects the session against Internet Information Services (IIS) and ASP.NET process failures. By separating the session state from the page itself, you can also much more easily scale an existing application to Web farm and Web garden architectures. In addition, the session state living in an external process eliminates at the root the risk of periodically losing data because of process recycling. As mentioned, the ASP.NET session-state provider is a Windows service named aspnet_state.exe. It normally resides in the installation folder of ASP.NET:
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%WINDOWS%\Microsoft.NET\Framework\[version]
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As usual, note that the final directory depends on the .NET Framework version you re actually running. Before using the state server, you should make sure that the service is up and running on the local or remote machine used as the session store. The state service is a
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Part IV
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Infrastructure of the Application
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constituent part of ASP.NET and gets installed along with it, so you have no additional setup application to run. By default, the state service is stopped and requires a manual start. You can change its configuration through the properties dialog box of the service, as shown in Figure 17-4.
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FIGURE 17-4 The properties dialog box of the ASP.NET state server.
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An ASP.NET application needs to specify the TCP/IP address of the machine hosting the session-state service. The following listing shows the changes that need to be made to the web.config file to enable the remote session state:
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<configuration> <system.web> <sessionState mode="StateServer" stateConnectionString="tcpip=MyMachine:42424" /> </system.web> </configuration>
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Note that the value assigned to the mode attribute is case sensitive. The format of the stateConnectionString attribute is shown in the following line of code. The default machine address is 127.0.0.1, while the port is 42424.
stateConnectionString="tcpip=server:port"
The server name can be either an IP address or a machine name. In this case, though, non-ASCII characters in the name are not supported. Finally, the port number is mandatory and cannot be omitted.
17 ASP.NET State Management
Important The state server doesn t offer any authentication barrier to requestors, meaning that anyone who can get access to the network is potentially free to access session data. To protect session state and make sure that it is accessed only by the Web server machine, you can use a firewall, IPSec policies, or a secure net 10.X.X.X so that external attackers can t gain direct access. Another security-related countermeasure consists of changing the default port number. To change the port, you edit the Port entry under the registry key: HKEY_LOCAL_MACHINE\ SYSTEM\CurrentControlSet\Services\aspnet_state\Parameters. Writing the port in the web.config file isn t enough. The ASP.NET application attempts to connect to the session-state server immediately after loading. The aspnet_state service must be up and running; otherwise, an HTTP exception is thrown. By default, the service is not configured to start automatically. The state service uses .NET Remoting to move data back and forth. Note The ASP.NET state provider runs under the ASP.NET account. The account, though, can be
configured and changed at will using the Service Control Manager interface. The state service is slim and simple and does not implement any special features. It is limited to holding data and listens to the specified port for requests to serve. In particular, the service isn t cluster-aware (that is, it doesn t provide a failover monitor to be error tolerant) and can t be used in a clustered world when another server takes on the one that fails.
Finally, note that by default the state server listens only to local connections. If the state server and Web server live on different machines, you need to enable remote connections. You do this through another entry in the same registry key as mentioned earlier. The entry is AllowRemoteConnection, and it must be set to a nonzero value.
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