I use visual studio 2010-12 and I installed ADO.NET Entity Framework 4.1 , Mysql .Net Connector and Mysql Workbench
Before formatting, my computer, I could use entity framework for MySQL. but not I cant see MySQL in data source list. Here is what I mean

Well…where is the my mistake or missing?
Okay I solved, I opened server explorer and I connected to mysql database, after I tried to add an ado.net entity framework object and it works