Visual C# 2015 cannot be opened because it is version 782. this server supports version 706 and earlier.

要利用ADO.NET連接 LocalDB 時發生錯誤，Data Source 使用 (LocalDb)/v11.0，解決方案

要解決此問題，將 Data Source 從:

DataSource=(LocalDb)\v11.0;Integrated Security=true;
AttachDbFileName=C:\MyFolder\MyData.mdf;

改為:

DataSource=(LocalDB)\MSSQLLocalDB;Integrated Security=true;
AttachDbFileName=C:\MyFolder\MyData.mdf;

就可以正常連接了

關鍵在 Data Source的 Local Db，更正後就可以使用了!

Reference:
http://www.codeproject.com/Questions/997968/cannot-be-opened-because-it-is-version-this-server