Over the past few years, the world has seen an explosion of new wireless devices, such as cell phones, pagers, and personal digital assistants (PDAs), which enable users to browse Web sites at any time from any location. Developing applications for these devices is challenging for the following reasons:

• Different markup languages are necessary, including HTML for PDAs, wireless markup language (WML) for wireless application protocol (WAP) cell phones, and compact HTML (cHTML) for Japanese i-mode phones.

• Devices have different form factors. For example, devices have varying numbers of display lines, horizontal or vertical screen orientation, and color or black and white displays.

• Devices have different network connectivity, ranging from 9.6 KB cellular connections to 11 MB Wireless LANs.

• Devices have different capabilities. Some devices can display images, some can make phone calls, and some can receive notification messages.

The Microsoft Mobile Internet Toolkit addresses these challenges by isolating them from the details of wireless development. Thus, developers can quickly and easily build a single, mobile Web application that delivers appropriate markup for a wide variety of mobile devices.

The Mobile Internet Toolkit contains:

• Mobile Web Forms Controls that generate markup language for different devices.

• Mobile Internet Designer that works with the Visual Studio .NET integrated design           environment (IDE) to provide a drag-and-drop mobile development environment.

• Browser Capabilities those are rich enough to extend ASP.NET device capabilities to mobile devices.

• Quick Start Tutorial with sample code.

• Developer Documentation.

• Device adapter code samples.

Mobile Web Forms Controls

The mobile Web Forms controls are ASP.NET server-side controls that provide user interface elements such as list, command, call, calendar, and so on. At execution time, the mobile controls generate the correct markup for the device that makes the request. As a result, you can write a mobile application once and access it from multiple devices. Because these mobile controls are based on the ASP.NET controls, you can leverage your current desktop development skill set when creating mobile applications. You can also reuse the same business logic and data access code that you use in your desktop application. Mobile and desktop Web Forms can reside in the same Visual Studio .NET project. This makes an application faster to develop and lowers your maintenance cost.

The following example provides just a taste of programming with mobile controls. In this example, the Hello, World program creates a mobile Web Forms page with a single form on it. That form contains a Label control with the string: "Hello, Mobile World".

<%@ Page language="c#" Inherits="System.Web.UI.MobileControls.MobilePage" %>
<%@ Register TagPrefix="Mobile" Namespace="System.Web.UI.MobileControls" Assembly="System.Web.Mobile" %>
<mobile:Form id=Form1 runat="server">
<mobile:Label id=Test Runat="Server">Hello, Mobile World</mobile:Label>
</mobile:Form>

The Mobile Internet Toolkit also enables you to customize the markup that is generated by mobile controls for a specific device. You can designate templates and styles for a specific device within the mobile page.

Mobile Internet Designer

The Mobile Internet Designer extends the Visual Studio .NET IDE to create mobile applications. After you install the Mobile Internet Designer, you can create and develop your mobile application in the same way that you would develop a Windows Forms or Web Forms application. The Mobile Internet Designer leverages the traditional Visual Studio design environment so that you can:

• Create a mobile Web project.

• Add a mobile Web Forms page to the project.

• Drag a mobile Web Forms control onto the form.

• Double-click the control to write the logic.

• Rebuild the application.

• Run the application.

The Mobile Internet Designer makes it fast and easy to build and maintain mobile Web applications. In addition, it enables today's desktop developers to quickly learn how to create mobile applications by using Visual Studio .NET.

Device Capability Mechanism

Accurate information about the display capabilities of the target device is essential for the successful rendering of mobile controls. At a minimum, mobile controls need the following information about a device:

• Markup language (HTML, WML, cHTML)

• Browser

• Number of display lines

• Cookie support

• Screen size

The Mobile Internet Toolkit adds these mobile device capabilities to the server's machine.config file (desktop ASP.NET applications use this file to maintain device and browser information).

Advanced Features: Extensibility

In addition to adding device characteristics, the Mobile Internet Toolkit includes device adapters for a variety of mobile devices. The device capabilities information in the machine.config file allows device adapters to optimize markup for specific devices. You can create new aggregate controls from existing mobile controls. The Mobile Internet Toolkit supports device adapters for additional devices through the device capabilities mechanism.

Conclusion

The Mobile Internet Toolkit provides the technology and tools to build, deploy, and maintain sophisticated mobile applications quickly. Tight integration with Visual Studio .NET ensures that developers can leverage their existing desktop skill set and produce mobile applications. Additional device support can be added using the Mobile Internet Toolkit's extensibility features.