asp.net如何串連資料庫

asp教程.net如何串連資料庫教程
下面是一款利用asp.net教程 c來串連mssql資料庫，並查詢出指定的資料哦。

string connstr = system.web.configuration.webconfigurationmanager.connectionstrings["sqlconnstr"].connectionstring;//這裡
        sqlconnection conn = new sqlconnection(connstr);
        sqlcommand cmd = new sqlcommand();
        cmd.connection = conn;
        cmd.commandtext = "select id,xingming,gh from users where gh>600";
        try
        {
            conn.open();
            sqldatareader dr = cmd.executereader();
            this.gridview1.caption = "員工資訊表";
            this.gridview1.datasource = dr;
            this.gridview1.databind();

        }
        catch (sqlexception gh)
        {
            throw gh;

        }
        finally
        {
            if (conn.state == connectionstate.open)
            {
                conn.close();
                       
            }
       
        }

    }