求高手帮忙解释一下这个页面代码每一句具体的作用，急~~~

imports   system.data  
  imports   system.data.oledb  
          private   sub   page_load(byval   sender   as   system.object,   byval   e   as   system.eventargs)   handles   mybase.load  
                  在此处放置初始化页的用户代码  
   
                  dim   str1   as   string   =   "provider=microsoft.jet.oledb.4.0;   data   source="   &   server.mappath("bookmanage.mdb")  
                  dim   str2   as   string   =   "select   book_id   as   图书编号,   bookname   as   图书名称,bookpub   as   出版社,bookprice   as   价格,author   as   作者   from   book"  
                  dim   ad   as   oledbdataadapter  
                  ad   =   new   oledbdataadapter(str2,   str1)  
                  ad.fill(ds,   "book")  
                  dim   dv   as   dataview   =   ds.tables("book").defaultview  
                  datagrid1.datasource   =   dv  
                  datagrid1.databind()  
          end   sub  
        private   sub   datagrid1_sortcommand(byval   source   as   object,   byval   e   as   system.web.ui.webcontrols.datagridsortcommandeventargs)   handles   datagrid1.sortcommand  
                  dim   dv1   as   dataview   =   ds.tables("book").defaultview  
                  dv1.sort   =   e.sortexpression  
                  datagrid1.datasource   =   dv1  
                  datagrid1.databind()  
          end   sub  
   
          private   sub   datagrid1_pageindexchanged(byval   source   as   object,   byval   e   as   system.web.ui.webcontrols.datagridpagechangedeventargs)   handles   datagrid1.pageindexchanged  
                  dim   dv1   as   dataview   =   ds.tables("book").defaultview  
                  datagrid1.datasource   =   dv1  
                  datagrid1.currentpageindex   =   e.newpageindex  
                  datagrid1.databind()  
          end   sub  
  end   class

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asp.net+vb.net  
   
  先导入名称空间,在页面加载的时候,查询book表数据并绑定到datagrid1控件.  
   
  datagrid1_sortcommand是对数据进行排序,datagrid1_pageindexchanged是取得当前页的记录.  
   
  你贴的代码不全,贴出来就大概这意思.