错误创建在Visual Studio中的SQL Server数据库

我想创建在Visual Studio 2010中一个新的SQL数据库，并在输入服务器名和数据库名称，然后pressing好吧，我得到这个错误。

I am trying to create a new SQL DB in Visual Studio 2010, and Upon entering a Server Name and a DB name then pressing Ok, I get this error.

建立SQL Server的连接时发生网络相关的或特定于实例的错误。服务器未找到或无法访问。验证实例名称是否正确，以及SQL Server配置为允许远程连接。 （provider：命名管道提供程序，error：40 - 无法打开到SQL Server的连接）

A network-related or instance-specific error occurred 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: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)

任何想法？