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The following example implements the server-side functionality as an HTTP handler. The HTTP handler accepts information through the query string (in this case, it checks for two parameters) and then returns two pieces of information. The first piece of information is the sum of the two arguments that were passed in through the query string. The second piece of information is the current time on the web server. The information is not a legitimate XML document instead, the two values are simply separated by a comma. Here s the complete code for the HTTP handler: public class CalculatorCallbackHandler : IHttpHandler { public void ProcessRequest (HttpContext context) { HttpResponse response = context.Response; // Write ordinary text. response.ContentType = "text/plain";

For the most part, cookies are widely adopted because so many sites use them However, they can limit your potential audience, and they aren t suited for the embedded browsers used with mobile devices Before you can use cookies, you should import the SystemNet namespace so you can easily work with the appropriate types, as shown here: using SystemNet; Cookies are fairly easy to use Both the Request and Response objects (which are provided through Page properties) provide a Cookies collection The important trick to remember is that you retrieve cookies from the Request object, and you set cookies using the Response object To set a cookie, just create a new SystemNet HttpCookie object You can then fill it with string information (using the familiar dictionary pattern) and attach it to the current web response, as follows: // Create the cookie object.

When you enable the HTTP handler for Atlas web services, you gain the ability to use JSON calls. However, you don t remove the ability to use other protocols. In other words, SOAP-based clients can still interact with your web service.

// Get the query string arguments. float value1, value2; if (Single.TryParse(context.Request.QueryString["value1"], out value1) & Single.TryParse(context.Request.QueryString["value2"], out value2)) { // Calculate the total. response.Write(value1 + value2); response.Write(","); // Return the current time. DateTime now = DateTime.Now; response.Write(now.ToLongTimeString()); } else { // The values weren't supplied or they weren't numbers. // Indicate an error. response.Write("-"); } } public bool IsReusable { get { return true; } } }

HttpCookie cookie = new HttpCookie("Preferences"); // Set a value in it cookie["LanguagePref"] = "English"; // Add it to the current web response ResponseCookiesAdd(cookie); A cookie added in this way will persist until the user closes the browser and will be sent with every request To create a longer-lived cookie, you can set an expiration date, as shown here: // This cookie lives for one year cookieExpires = DateTimeNowAddYears(1);.

Now that you ve created the web service you need, the next step is to configure your page so it knows about TerritoriesService. That way, the ScriptManager will automatically generate a JavaScript proxy, which you can use to make your calls.

In this example, the HTTP handler has an unrealistically easy job. After all, if you were simply interested in adding two numbers, your client-side code could accomplish the task without the Ajax request. This pattern becomes more important when the server-side code needs to do something the client can t, such as look up information in a server-side resource (a file or database), use sensitive information (such as secret numbers), or perform complex operations using classes that are available only in the .NET Framework.

In addition to the fields retrieved from the data source, you can add calculated columns. Calculated columns are ignored when retrieving and updating data. Instead, they represent a value that s computed using a combination of existing values. To create a calculated column, you simply create a new DataColumn object (specifying its name and type) and set the Expression property. Finally, you add the DataColumn to the Columns collection of the DataTable using the Add() method. As an example, here s a column that uses string concatenation to combine the first and last name into one field: DataColumn fullName = new DataColumn( "FullName", typeof(string), "TitleOfCourtesy + ' ' + LastName + ', ' + FirstName"); ds.Tables["Employees"].Columns.Add(fullName);

To configure your page to use TerritoriesService, you simply add the <Services> section in the tag for the ScriptManager control. This section lists all the services your page uses and their locations: <atlas:ScriptManager ID="ScriptManager1" runat="server" > <Services> <atlas:ServiceReference Path="~/TerritoriesService.asmx" </Services> </atlas:ScriptManager>