Microsoft Visual Studio LightSwitch is an IDE specifically tailored for creating line-of-business applications built on existing .NET technologies and Microsoft platforms. The applications produced are architecturally 3-tier: the user interface runs on Microsoft Silverlight; the logic and data-access tier is built on WCF RIA Services and Entity Framework, hosted in ASP.NET; and the primary data storage supports Microsoft SQL Server Express, Microsoft SQL Server and Microsoft SQL Azure. LightSwitch also supports other data sources including Microsoft SharePoint. LightSwitch includes graphical designers for designing entities and entity relationships, entity queries, and UI screens. Business logic may be written in either Visual Basic or Visual C#. The tool can be installed as a stand-alone SKU or as an integrated add-in to Visual Studio 2010 Professional and higher.