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To make matters worse, after an item was in an invalid state, it had to be reset by a system administrator, meaning that the user had to contact us to fix a problem Luckily, we had great exception management Whenever a timeout occurred, our customer support rep was notified concerning which user experienced the error, and then the rep contacted the user immediately to head off any frustrations On multiple occasions, people who experienced a problem were contacted in less than 30 seconds and were amazed with our responsiveness Our clients never got a chance to complain about errors because they were dazzled by our ability to serve them We also analyzed our error log to help pinpoint the cause of the problem, which turned out to be a database-locking issue.

In some situations, you might want to have several URLs lead to the same page. This might be the case for a number of reasons maybe you want to implement your logic in one page and use query string arguments but still provide shorter and easier-to-remember URLs to your website users (often called friendly URLs). Or maybe you have renamed a page, but you want to keep the old URL functional so it doesn t break user bookmarks. Although web servers sometimes provide this type of functionality, ASP.NET 2.0 now includes its own URL mapping feature. The basic idea behind ASP.NET URL mapping is that you map a request URL to a different URL. The mapping rules are stored in the web.config file, and they re applied before any other processing takes place. Of course, for ASP.NET to apply the remapping, it must be processing the request,

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which means the request URL must use a file type extension that s mapped to ASP.NET. (See 18 for more information about how to configure ASP.NET to handle file extensions that it wouldn t ordinarily handle.) You define URL mapping in the <urlMappings> section of the web.config file. You supply two pieces of information the request URL (as the attribute url) and the new destination URL (mappedUrl). Here s an example: <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> <system.web> <urlMappings enabled="true"> <add url="~/Category.aspx" mappedUrl="~/Default.aspx category=default" /> <add url="~/Software.aspx" mappedUrl="~/Default.aspx category=software" /> </urlMappings> ... </system.web> </configuration> To make a match, the incoming URL must be requesting the same page. However, the case of the request URL is ignored, as are query string arguments. Unfortunately, there s no support for advanced matching rules, such as wildcards or regular expressions. When you use URL mapping, the redirection is performed in the same way as the Server.Transfer() method, which means there is no round-trip and the URL in the browser will still show the original request URL, not the new page. In your code, the Request.Path and Request.QueryString properties reflect the new (mapped) URL. The Request.RawUrl property returns the original friendly request URL. This can introduce some complexities if you use it in conjunction with site maps namely, does the site map provider try to use the original request URL or the destination URL when looking for the current node in the site map The answer is both. It begins by trying to match the request URL (provided by Request.RawUrl property), and if no value is found, it then uses the Request.Path property instead. This is the behavior of the XmlSiteMapProvider, so you could change it in a custom provider if desired.

Everyone s applications will have unexpected errors, but how you handle those unexpected errors and what you learn from them is what will ultimately set you apart This chapter covers techniques for managing exceptions that will allow you to see where they occur, when they occur, and which users are experiencing them You ll learn how to analyze those errors so you can make your application less error prone, how to incorporate global error handling, and even how to leverage errors to manage customer perception and satisfaction Here is a breakdown of the chapter content: Exception Basics: A quick refresher on exceptions, exception handling, error propagation, and the nuances of the Try Catch Finally block Global Error Handling: Discusses how to use custom error pages and global error pages as a catchall for exceptions that may arise.

<asp:Button ID="SetStateButton" runat="server" Text="Set State" OnClick="SetStateButton_Click"> </asp:Button>  <asp:Button ID="SubmitPageButton" runat="server" Text="Submit Page"></asp:Button><br /> <input id="HiddenName" type="hidden" runat="server" /> <br /> <asp:HyperLink ID="URLEncodeLink" runat="server"> Link to encode name in URL</asp:HyperLink><br /> <br /> <h3> Results</h3> Cookie:<asp:Label ID="CookieLabel" runat="server"></asp:Label><br /> URL:<asp:Label ID="URLLabel" runat="server"></asp:Label><br /> Hidden Variable:<asp:Label ID="HiddenLabel" runat="server"></asp:Label><br /> ViewState:<asp:Label ID="ViewStateLabel" runat="server"></asp:Label><br /> </asp:Content> Listing 3-2. The ClientState Web Form Code-Behind Class File using System; namespace ControlsBook2Web.Ch03 { public partial class ClientState : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { GetClientState(); } protected void SetStateButton_Click(object sender, EventArgs e) { SetClientState(); } private void SetClientState() { string name = NameTextBox.Text; // set the name Cookie value Response.Cookies["cookiename"].Value = name; // encode the name in the redirect URL URLEncodeLink.NavigateUrl = "ClientState.aspx urlname=" + name;

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