The TCP/IP connection to the host localhost, port 1433 has failed. Error: “Connection refused: connect. Verify the connection properties, check that an instance of SQL Server is running on the host and accepting TCP/IP connections at the port, and that no firewall is blocking TCP connections to the port.
检查您的SQL Server设置是否允许接受TCP / IP连接。启用TCP / IP
并重新启动SQL Server。然后再次测试您的代码。
