Unable to establish connection to database.

• Error information:
  SQL Server 的 Microsoft OLE DB 提供者 (0x80004005)
  [DBNMPNTW]找不到指定的 SQL Server。
• Other possible cause of this problem:
  The database cannot be opened, most likely due to incorrect connection settings or insufficient security set on your database folder or file.
  For more details please refer to http://support.microsoft.com/default.aspx?scid=kb;en-us;Q306518