Silverlight Is Microsoft Ria (Reach Internet Application) technology that gather rich windows Control and reach web platform in one place. Silverlight is a client base technology so the Pressure on server and network became minimum and the user enjoy from beautiful, fast, interactive environment. Silverlight develop and debug in visual studio. This makes silverlight development fast and reliable .and of course reduces the cost. We buy and learn telerik silverlight controls and use their capability. Silverlight has a great integration with SharePoint and We use this two before and have enough experience. Silverlight has a 3D capability build-in so we can imagine and build 3d web forms easily. many of facebook games was build in this technology.