c# winform下的datagrid更新问题

            SqlConnection cnn = new SqlConnection();
            cnn.ConnectionString = "Data Source=WWW-85DA5A3EDED;Initial Catalog=jizhang;uid=sa;pwd=lsj;";
            cnn.Open();
            string sql = "Select   *   from  price";
            SqlDataAdapter dbAdapt = new SqlDataAdapter(sql, cnn);
            SqlCommandBuilder ddb = new SqlCommandBuilder(dbAdapt);  
            dbAdapt.UpdateCommand = ddb.GetUpdateCommand();   
            DataSet ds = new DataSet();
            dbAdapt.Fill(ds, "price");
            DataTable dbTable = ds.Tables["price"];
            dbAdapt.Update(ds, "price");
            ds.AcceptChanges();//加不加都没用 
数据库不更新是为什么？ --------------------编程问答-------------------- 专业打捞沉帖

补充：.NET技术 ,  C#