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The error that you re dealing with arises when the DELETE query is called, so you need to add the Deleted event handler to the GridView (the same principal applies if you re executing an INSERT or UPDATE query and using the Inserted or Updated event handlers) The argument to the Deleted event handler, a GridViewDeletedEventArgs object, has an Exception property that contains the exception that was raised, or null if no exception was raised If the Exception property is not null, you know an error has occurred, and you can show this to the user: if (eException != null) { lblErrorVisible = true; lblErrorText = eExceptionMessage; eExceptionHandled = true; } You first make sure the Label is visible, and then show the exact Message to the user.

.NET tracks each session using a unique 120-bit identifier. ASP.NET uses a proprietary ASP algorithm to generate this value, thereby guaranteeing (statistically speaking) that the number

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is unique and it s random enough that 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 session-related 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 objects you stored previously, and places them into a special collection so they can be accessed in your code. This process takes place automatically. For this system to work, the client must present the appropriate session ID with each request. You can accomplish this in two ways: Using cookies: In this case, the session ID is transmitted in a special cookie (named ASP .NET_SessionId), which ASP .NET creates automatically when the session collection is used. This is the default, and it s also the same approach that was used in earlier versions of ASP . Using modified URLs: In this case, the session ID is transmitted in a specially modified (or munged) URL. This allows you to create applications that use session state with clients that don t support cookies. Session state doesn t come for free. Though it solves many of the problems associated with other forms of state management, it forces the server to store additional information in memory. This extra memory requirement, even if it is small, can quickly grow to performancedestroying levels as hundreds or thousands of clients access the site. In other words, you must think through any use of session state. A careless use of session state is one of the most common reasons that a web application can t scale to serve a large number of clients. Sometimes a better approach is to use caching, as described in 24.

want to add this functionality. Note that if you choose to restrict the number of photos per blog post, the user can get around this limit by simply creating more posts. As such, using an absolute number as a restriction may be a better solution (such as 20MB per user).

You also set the ExceptionHandled property of the GridViewDeletedEventArgs object to true to indicate that you ve handled the error By saying that you ve handled the error, you re telling the GridView not to worry about it, and the users won t see the ASPNET error page Instead, they will see your nice, red error message..

You can interact with session state using the System.Web.SessionState.HttpSessionState class, which is provided in an ASP.NET web page as the built-in Session object. The syntax for adding items to the collection and retrieving them is basically the same as for adding items to a page s view state. For example, you might store a DataSet in session memory like this: Session["InfoDataSet"] = dsInfo; You can then retrieve it with an appropriate conversion operation: dsInfo = (DataSet)Session["InfoDataSet"];

As mentioned previously, we must create a new action handler in the BlogmanagerController class to deal with image-handling operations. The different operations that can take place include uploading, reordering, and deleting. At this stage, we will only look at the upload operation. In addition to creating the new action handler, we must also create a new form processor to save the uploaded files as well as to report on any errors that may have occurred.

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