使用LinkButton实现DataList的分页问题，采用了

 <asp:LinkButton id="lbnPrevPage" Text="上一页" CommandName="pre" OnCommand="_OnClick" runat="server" />
  <asp:LinkButton id="lbnNextPage" Text="下一页" CommandName="next" OnCommand="_OnClick" runat="server" />

int CurrentPage=0;

public void _OnClick(Object sender, CommandEventArgs e)
    {

      Response.Write(CurrentPage+"");

　　 switch (e.CommandName)
        {
            case "next":
                if (CurrentPage < (PageCount - 1)) CurrentPage = CurrentPage+1;
                break;
            case "pre":
                if (CurrentPage > 0) CurrentPage-=1;
                break;
        }  

}

发现第一次点击LinkList的时候执行了_OnClick事件 ，后来点击就不管用?为什么?