Data Source/ server：sql server名称   (localhost / .\sqlexpress )

Initial catalog/ database：数据库名

 示例如下：

1.
         
        
      string settings = Convert.ToString(ConfigurationManager.ConnectionStrings["SqlServices"]);  SqlConnection myconn = new SqlConnection(settings);  myconn.Open();2.conn.ConnectionString = "Data Source=.\\SQLExpress;Integrated Security=true; AttachDbFilename=|DataDirectory|\\Database.mdf;User Instance=true;";

Integrated Security/ uid，pwd：登陆方式（SSPI）