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public partial class TestAsync : System.Web.UI.Page { const String RSSFEED = "http://weblogs.asp.net/despos/rss.aspx"; private WebRequest req; public String RssData { get; set; } void Page_Load (Object sender, EventArgs e) { AddOnPreRenderCompleteAsync(BeginTask, EndTask); } IAsyncResult BeginTask(Object sender, EventArgs e, AsyncCallback cb, Object state) { // Trace Trace.Warn("Begin async: Thread=" + Thread.CurrentThread.ManagedThreadId.ToString()); // Prepare to make a Web request for the RSS feed req = WebRequest.Create(RSSFEED); // Begin the operation and return an IAsyncResult object return req.BeginGetResponse(cb, state); } void EndTask(IAsyncResult ar) { // This code will be called on a(nother) pooled thread using (var response = req.EndGetResponse(ar)) { String text; using (var reader = new StreamReader(response.GetResponseStream())) { text = reader.ReadToEnd(); } // Process the RSS data rssData = ProcessFeed(text); } // Trace Trace.Warn("End async: Thread=" + Thread.CurrentThread.ManagedThreadId.ToString()); // The page is updated using an ASP-style code block in the ASPX // source that displays the contents of the rssData variable }

String ProcessFeed(String feed) { // Build the page output from the XML input ... } }

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give an example of using the trial-and-error method to discover how to query a DMV that has required restrictions 6 In the DMV mdx query window, select the Date Dimension Stats #1 query, and on the SSMS toolbar, click Execute The results window displays the error The DIMENSION_NAME restriction is required but is missing from the request Consider using SYSTEMRISTRICTSCHEMA to provide restrictions This error message indicates that you must select from the SYSTEMRESTRICTSCHEMA function Instead of using the DISCOVER_DIMENSION_STAT DMV in the FROM clause of your query, you will instead call the SYSTEMRESTRICTSCHEMA function and include the DMV name DISCOVER_ DIMENSION_STAT as the first parameter and a DIMENSION_NAME column filter as the second parameter 7 In the DMV mdx query window, select the Date Dimension Stats #2 query, and on the SSMS toolbar, click Execute .

As you can see, such an asynchronous page differs from a standard one only for the aforementioned elements the Async directive attribute and the pair of asynchronous event handlers. Figure 5-4 shows the sample page in action.

When you publish a report, Reporting Services stores the report definition in a SQL Server database named ReportServer database (introduced in 2, Installing Reporting Services ). You can also publish other items, such as images referenced by reports or other file types that need to be accessed by the reporting community. If you re a report author, you will generally use Microsoft Visual Studio to publish reports. If you re a report administrator, you can use either Report Manager or a small utility named rs.exe to move previously created reports to the ReportServer database. You can even use a custom application for publishing reports by using the Reporting Services Web Services API, which is covered in greater detail in 15, Programming Report Server Management. ( 15 can be found on the companion CD.)

It would also be interesting to take a look at the messages traced by the page. Figure 5-5 provides visual clues of it. The Begin and End stages are served by different threads and take place at different times. Note the time elapsed between the Exit BeginTask and Enter EndTask stages. It is much longer than intervals between any other two consecutive operations. It s in that interval that the lengthy operation in this case, downloading and processing the RSS feed took place. The interval also includes the time spent to pick up another thread from the pool to serve the second part of the original request.

The AddOnPreRenderCompleteAsync method is not the only tool you have to register an asynchronous task. The RegisterAsyncTask method is, in most cases, an even better solution. RegisterAsyncTask is a void method and accepts a PageAsyncTask object. As the name suggests, the PageAsyncTask class represents a task to execute asynchronously. The following code shows how to rework the sample page that reads some RSS feed and make it use the RegisterAsyncTask method:

void Page_Load (object sender, EventArgs e) { PageAsyncTask task = new PageAsyncTask( new BeginEventHandler(BeginTask), new EndEventHandler(EndTask), null, null); RegisterAsyncTask(task); }

The results window displays the error The DATABASE_ NAME restriction is required but is missing from the request The DISCOVER_ DIMENSION_STAT view must also be restricted by a filter on the DATABASE_NAME column 8 In the DMV mdx query window, select the Date Dimension Stats #3 query, and on the SSMS toolbar, click Execute The query executes successfully, indicating that the DISCOVER_DIMENSION_STAT view has two required restrictions The view displays the names of all the non-key attributes and lists the number of members in each attribute The queries you have executed in steps 1 through 8 all return metadata In the next step, you will execute a query that displays the amount of memory consumed by hierarchies in the Date dimension 9 In the DMV mdx query window, select the Date Dimension Memory Usage query, and on the SSMS toolbar, click Execute .

The constructor accepts up to five parameters, as shown in the following code:

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