Asp.net怎么得到数据库查询的值

例子: //建立数据库连接对象sc SqlConnection sc = new SqlConnection(); //数据库连接字符串 sc.ConnectionString = "server=.;database=wangjun;uid=sa;pwd=sqlserver"; //打开数据库 sc.Open(); Console.WriteLine("已经连接"); //数据库命令对