在数据源(在Visual Studio的左侧)中，右键单击数据库，然后使用向导配置数据源.将出现一个新窗口，展开连接"字符串，您可以在其中找到连接字符串

In Data Source (on the left of Visual Studio) right click on the database, then Configure Data Source With Wizard. A new window will appear, expand the Connection string, you can find the connection string in there