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To remember the value of the userFavoriteCar string type between postbacks, one approach is to store the value of this string type in a session variable. We will examine the details of session state in the pages that follow. For the sake of completion, however, here are the necessary updates for the current page (note that you are no longer using the private string member variable, so feel free to comment out or remove the definition altogether): public partial class _Default : System.Web.UI.Page { // State data // private string userFavoriteCar = "Yugo"; protected void Page_Load(object sender, EventArgs e) { } protected void btnSetCar_Click(object sender, EventArgs e) { // Store value to be remembered in session variable. Session["UserFavCar"] = txtFavCar.Text; } protected void btnGetCar_Click(object sender, EventArgs e) { // Get session variable value. lblFavCar.Text = (string)Session["UserFavCar"]; } } If you now run the application, the value of your favorite automobile will be preserved across postbacks, thanks to the HttpSessionState object manipulated indirectly by the inherited Session property.

ASP.NET provides several mechanisms you can use to maintain stateful information in your web applications. Specifically, you can: Use ASP.NET view state. Use ASP.NET control state. Define application-level data. Use the cache object. Define session-level data. Define cookie data.

Caution The file contains a directory structure that mirrors the directory structure of Drupal. When extracting it, be careful to use an extraction method that merges the directory structure in the tarball with your existing Drupal directory structure. The default extractor in Mac OS X will not do it correctly. If you end up with a folder called fr7.x-1.1 after extraction, the merge did not take place. See www.lullabot.com/videocast/installing-drupaltranslation for a screencast demonstrating the proper way to do the extraction.

In addition to these techniques, if you want to persist user data in a permanent manner, ASP.NET provides an out-of-the-box Profile API. We ll examine the details of each approach in turn, beginning with the topic of ASP.NET view state.

The term view state has been thrown out a few times here and in the previous two chapters without a formal definition, so let s demystify this term once and for all Under classic (COM-based) ASP, web developers were required to manually repopulate the values of the incoming form widgets during the process of constructing the outgoing HTTP response For example, if the incoming HTTP request contained five text boxes with specific values, the *asp file required script code to extract the current values (via the Form or QueryString collections of the Request object) and manually place them back into the HTTP response stream Needless to say, this was a drag If the developer failed to do so, the caller was presented with a set of five empty text boxes! Under ASP.

NET, we no longer have to manually scrape out and repopulate the values in the HTML widgets because the ASPNET runtime automatically embeds a hidden form field (named __VIEWSTATE), which will flow between the browser and a specific page The data assigned to this field is a Base64encoded string that contains a set of name/value pairs representing the values of each GUI widget on the page at hand The SystemWebUIPage base class s Init event handler is the entity in charge of reading the incoming values in the __VIEWSTATE field to populate the appropriate member variables in the derived class (This is why it is risky at best to access the state of a web widget within the scope of a page s Init event handler.

After successful extraction of the translation, additional folders called translations should be found in your Drupal directories. For example, the profiles/default folder (where Drupal s default installation profile lives) now has a translations subfolder containing a fr.po file. That s the French translation of the installer. When Drupal s installer runs, you can see the new choice presented, as shown in Figure 19-15. If you choose French, the installation will proceed in French, and the default language for the site will be set to French.

) Also, just before the outgoing response is emitted back to the requesting browser, the __VIEWSTATE data is used to repopulate the form s widgets Clearly, the best thing about this aspect of ASPNET is that it just happens without any work on your part Of course, you are always able to interact with, alter, or disable this default functionality if you so choose To understand how to do this, let s see a concrete view state example..