“Mango” is the internal name for the Windows Phone SDK 7.1 release. To write a windows phone 7 application, you need to install Windows Phone SDK and you can use C#, VB.NET or F# to develop your applications. The Windows Phone SDK includes the following tools:

1- Microsoft Visual Studio 2010 Express for Windows Phone
2- Windows Phone Emulator
3- Windows Phone SDK 7.1 Assemblies
4- Silverlight 4 SDK and DRT
5- Windows Phone SDK 7.1 Extensions for XNA Game Studio 4.0
6- Microsoft Expression Blend SDK for Windows Phone 7
7- Microsoft Expression Blend SDK for Windows Phone OS 7.1
8- WCF Data Services Client for Window Phone
9- Microsoft Advertising SDK for Windows Phone

Expression Blend for Windows Phone is a design suite that allows you to create and add special visual features, such as gradients, animations, and transitions.

For some tasks, Expression Blend is easier to use than Visual Studio. The following list contains some of the tasks that are easily accomplished with Expression Blend.
– Create data templates visually
– Use design-time sample data to visualize data templates
– Create control styles visually
– Create and preview animations