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Silverlight Interview Questions and Answers

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Silverlight Interview Questions and Answers

Question - 11 : - What is Silverlight Runtime?

Answer - 11 : - Silverlight Runtime is a browser plug-in to support Silverlight enabled applications. If the Silverlight runtime is not installed, browsers will not be able to run Silverlight elements in the browser. You can set up your Silverlight tags in such a way that your browser will automatically prompt the user to download and install the Silverlight plug-in when your application is launched in the browser. Installing the run time is a onetime operation on the client. Once installed, it will be automatically launched when any Silverlight application is loaded in the browser. Note: Silverlight plug-in and the runtime, both are the same; however, I am giving two definitions here.

Question - 12 : - What is Silverlight SDK?

Answer - 12 : - Silverlight SDK is a set of tools, documentation, samples, and templates for web developers to enable them to easily develop Silverlight enabled applications. The SDK is not really mandatory to develop Silverlight applications; however, the SDK will make development much easier.

Question - 13 : - What are the tools required to develop Silverlight applications?

Answer - 13 : - To run Silverlight applications in a web browser, you need to have the Silverlight runtime installed on the client browser as a plug-in. This is a light-weight version of the .NET runtime. However, to develop a Silverlight application, you need something more. Silverlight SDK: This includes a set of tools required to compile and build Silverlight controls. If you are comfortable writing HTML using Notepad and compiling .NET applications from console tools, then you just need the Silverlight SDK to develop Silverlight applications. However, most people use some kind of IDE to develop applications faster. Microsoft offers two separate tools to develop Silverlight applications: • Microsoft Expression Studio - This tool is meant for web designers to create rich visual elements for Silverlight applications. Expression Studio is recommended for web designers who create rich internet applications with enhanced visual content and graphics. There are several features provided for creating enhanced graphics elements, with lot of options to pick color, font, etc. • Microsoft Visual Studio - This is the integrated development environment from Microsoft to develop .NET applications. Programmers can use Visual Studio to develop Silverlight applications which require programming. Visual Studio allows programmers to develop sophisticated Silverlight applications in any .NET language (like C#, VB.NET etc). Here are some other tools that you can use: • Install Deep Zoom Composer - This tool allows you to prepare your images for use with the Deep Zoom feature in Silverlight 3. • Download Silverlight Toolkit - This toolkit is a Microsoft project containing Silverlight controls, components, and utilities that can be downloaded and used in your Silverlight applications. It includes full source code, samples, and tests. • Download .NET RIA Services - Microsoft .NET RIA Services simplifies the traditional n-tier application pattern by bringing together the ASP.NET and Silverlight platforms. RIA Services provides a pattern to write application logic that runs on the mid-tier and controls access to data for queries, changes, and custom operations.

Question - 14 : - Which tool to use - Expression Studio or Visual Studio?

Answer - 14 : - If your Silverlight application includes just graphics and visual elements, then you can use Expression Studio. However, if you are a programmer and if your Silverlight application includes programming logic, then you might want to choose Visual Studio.

Question - 15 : - What are the Silverlight versions available so far?

Answer - 15 : - • Silverlight 1.0: Silverlight 1.0, which was developed under the codename Windows Presentation Foundation/Everywhere (WPF/E), consists of the core presentation framework which is responsible for the user interface (UI), interactivity, and user input, basic UI controls, graphics and animation, media playback, Digital Restrictions Management (DRM), and DOM integration • Silverlight 2: Silverlight 2 (previously referred to as version 1.1) includes a version of the .NET Framework, implementing the same full Common Language Runtime (CLR) version as .NET Framework 3.0. The XAML markup as well as the code is compiled into .NET assemblies which are then compressed using Zip and stored in a .xap file. • Silverlight 3: Silverlight version 3 was released in July 9, 2009, which is an extension to Silverlight 2.0, and mainly provides improvements in graphics capabilities, media management, application development areas (additional controls, enhanced binding support, and out-of-browser functionality), and integration in the designers' Expression Blend 3 tools.

Question - 16 : - What is a .xap file?

Answer - 16 : - A .xap file is a Silverlight-based application package (.xap) that is generated when the Silverlight project is built. A .xap file is the compressed output file for a Silverlight application. The .xap file includes AppManifest.xaml, the compiled output assembly of the Silverlight project (.dll), and the resource files referred to by the Silverlight application: • Web pages like .aspx files and .html files use Silverlight components by loading .xap files using the tag in HTML or by using the tag in ASP.NET pages. • ".xap" files (pronounced "zap") use the standard Zip compression algorithm to minimize client download size. Rename this file to SilverlightTest.zip and open it using any decompression tool. You can see that this is just like any other zip file, and it includes the project's output DLL and another file called "AppManifest.xaml".

Question - 17 : - How does XAP work?

Answer - 17 : - Once you have created the .xap file , the Silverlight 2 plug-in downloads the file and runs it in a separate work space.

Question - 18 : - How do I use a .xap file?

Answer - 18 : - A .xap file is used to contain and transfer the assemblies and resources of a managed code application. This managed code application must be run within the Silverlight 2 browser plug-in.

Question - 19 : - Can we add a reference to a Class Library project in a Silverlight application project?

Answer - 19 : - No, you can't add a reference to a Class Library project to a Silverlight application project. You can only add the reference of another Silverlight application project inside a Silverlight application project. However, you can add a reference to a Web Service or WCF Service.

Question - 20 : - What is a Silverlight.js file?

Answer - 20 : - Silverlight.js is a helper file which enables websites to create advanced Silverlight installation and instantiation experiences. You can call the createObject and createObjectEx functions defined in this file to embed the Silverlight plug-in in a web page.

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