windows 7 + visual studio 2010,建立sql server database 時，總是提示“a network-related or instance-specific error occured while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26-Error locating Server/Instance Specified)",我該怎么辦呢，請大家幫幫忙，謝謝了！