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bool isBc = false; if (year.EndsWith("BC", StringComparison.OrdinalIgnoreCase)) { isBc = true; year = year.Remove(year.IndexOf("BC" , StringComparison.OrdinalIgnoreCase)); year = year.Trim(); } // Get the population. int yearNumber = Int32.Parse(year); int population = GetPopulation(yearNumber, isBc); // Write the response. context.Response.ContentType = "text/plain"; context.Response.Write(population); } On the client side, you need to use the WebRequest class from the System.Net namespace. To make this class available, you must add a reference to the System.Net.dll assembly, which isn t included by default. WebRequest requires that you do all your work asynchronously. Whereas WebClient has one asynchronous step (downloading the response data), WebRequest has two: creating the request stream and then downloading the response. To use WebRequest, you first need to create a WebRequest object, configure it with the correct URI, and then call BeginGetRequestStream(). When you call BeginGetRequestStream(), you supply a callback that will write the request to the request stream when it s ready. In this example, that task falls to another method named CreateRequest(): private string searchYear; private void cmdGetData_Click(object sender, RoutedEventArgs e) { Uri address = new Uri("http://localhost:" + HtmlPage.Document.DocumentUri.Port + "/ASPWebSite/PopulationService.ashx"); // Create the request object. WebRequest request = WebRequest.Create(address); request.Method = "POST"; request.ContentType = "application/x-www-form-urlencoded"; // Store the year you want to use. searchYear = txtYear.Text; // Prepare the request asynchronously. request.BeginGetRequestStream(CreateRequest, request); } This code contains one other detail. Before calling BeginGetRequestStream(), the code copies the search year from the text box into a private field named searchYear. This technique serves two purposes. First, it ensures that the CreateRequest() callback can access the original search value, even if the user is somehow able to edit the text box before the CreateRequest() code runs. More important, this technique avoids threading headaches. Because the CreateRequest() callback runs on a background thread (not the main application thread), it

4. Install SQL Server 2008. 5. Copy the database to the new instance by using one of the methods previously listed. (These will be described in detail in the subsections that follow.) 6. Create the logins on the new instance by running the login script. 7. Create the jobs on the new instance by running the job script. 8. Check database connectivity and functionality. Installing SQL Server 2008 in this side-by-side approach is no different from doing a fresh install (described in 4). However, with a side-by-side upgrade, you also have to worry about migrating your database afterward. The following sections cover the three ways to perform that migration.

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can t directly access the elements in the page As you saw in 19, you can work around this problem using DispatcherBeginInvoke() However, copying the search year sidesteps the problem Typically, Silverlight calls your CreateRequest() method a fraction of a second after you call BeginGetRequestStream() At this point, you need to write the posted values as part of your request Often, web services use the same standard for posted values as HTML forms That means each value is supplied as a name-value pair, separated by an equal sign; multiple values are chained together with ampersands (&), as in FirstName=Matthew&LastName=MacDonald To write the data, you use a StreamWriter: private void CreateRequest(IAsyncResult asyncResult) { WebRequest request = (WebRequest)asyncResultAsyncState; // Write the year information in the name-value format "year=1985" Stream requestStream = requestEndGetRequestStream(asyncResult); StreamWriter writer = new StreamWriter(requestStream); writerWrite("year=" + searchYear); // Clean up (required) writerClose(); requestStream.

Note For new requirements, the score for each factor should default to 0. However, the default value logic is only applied when the item is first created. Since this is an existing record, the factors are all blank, and the edit form should require you to enter a value for each before you can save the record.

Close(); // Read the response asynchronously requestBeginGetResponse(ReadResponse, request); } After you ve written the request, you need to close the StreamWriter (to ensure all the data is written) and then close the request stream Next, you must call BeginGetResponse() to supply the callback that will process the response stream when it s available In this example, a method named ReadResponse() does the job To read the response, you use a StreamReader You also need error-handling code at this point, to deal with the exceptions that are thrown if the service can t be found If the response uses XML, it s also up to you to parse that XML now: private void ReadResponse(IAsyncResult asyncResult) { string result; WebRequest request = (WebRequest)asyncResultAsyncState; // Get the response stream WebResponse response = requestEndGetResponse(asyncResult); Stream responseStream = responseGetResponseStream(); try { // Read the returned text.

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