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When using custom mode, you need to indicate what session state store provider to use by supplying the customProvider attribute. The customProvider attribute points to the name of a class that s part of your web application in the App_Code directory or in a compiled assembly in the Bin directory or the GAC. The most common reasons to use a custom session state provider are to store session information in a database other than SQL Server or to use an existing table in a database that has a specific schema. Creating a custom state provider is a low-level task that needs to be handled carefully to ensure security, stability, and scalability, so it s always best to use a prebuilt provider that has been designed and tested by a reliable third party rather than roll your own.

But the real problem is that both approaches force you to declare every web control you want to use with a member variable This adds a lot of boilerplate code In ASPNET 20, you can solve the problem using a new language feature called partial classes, which let you split a single class into multiple source code files Essentially, the model is the same as before, but the control declarations are shuffled into a separate file You, the developer, never need to be distracted by this file instead you can just access your web-page controls by name Keen eyes will have spotted the word partial in the class declaration for your web-page code: Partial Class TestFormCodeBehind Inherits SystemWebUIPage .. End Class With this bit of infrastructure in place, the rest is easy Your .

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{ // Retrieve the physical directory path for the Upload // subdirectory. string destDir = Server.MapPath("./Upload"); // Extract the filename part from the full path of the // original file. string fileName = Path.GetFileName(Uploader.PostedFile.FileName); // Combine the destination directory with the filename. string destPath = Path.Combine(destDir, fileName); // Save the file on the server. Uploader.PostedFile.SaveAs(destPath); lblStatus.Text = "Thanks for submitting your file"; } } catch (Exception err) { lblStatus.Text = err.Message; } } } In the example, if a file has been posted to the server and isn t too large, the file is saved using the HttpPostedFile.SaveAs() method. To determine the physical path you want to use, the code combines the destination directory (Upload) with the name of the posted file using the static utility methods of the Path class. Figure 13-3 shows the page after the file has been uploaded.

One important detail to remember is that the user control s constituent controls can be accessed only by the user control. That means the web page that hosts the user control can receive the events, set the properties, or call the methods of these contained controls. For example, in the TimeDisplay user control the web page has no ability to access the LinkButton control that it uses. Usually, this behavior is exactly what you want. It means your user control can add public properties to expose specific details without giving the web page free reign to tamper with everything and potentially introduce invalid or inconsistent changes. For example, if you want to give the web page the ability to tweak the foreground color of the LinkButton control, you might add a ForeColor property to your user control. Here s an example: public Color ForeColor { get { return lnkTime.ForeColor; } set { lnkTime.ForeColor = value; } } To change the foreground color in your web-page code, you would now use code like this: TimeDisplay1.ForeColor = System.Drawing.Color.Green; This example maps the lnkTime.ForeColor property to the ForeColor property of the user control. This trick is usually the best approach, but it can become tedious if you need to expose a large number of properties. For example, your user control might render a table, and you might want to let the user configure the formatting of each table cell. In this case, it might make sense to expose the complete control object. Here s an example that exposes the lnkTime control for the TimeDisplay user control: public LinkButton InnerLink { get { return lnkTime; } }

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