为什么我的datagrid不能自定义分页
//html代码
<asp:datagrid   id= "DataGrid2 "   runat= "server "   Width= "320px "   AutoGenerateColumns= "False "   ShowHeader= "False "
GridLines= "None "   AllowCustomPaging= "True "   PageSize= "2 "   AllowPaging= "True "   OnPageIndexChanged= "DataGrid2_Page "> //该事件好象一直没触发义
<Columns>
<asp:TemplateColumn>
<ItemTemplate>
&nbsp; <IMG   src= "/liu/images/arrow.gif "> &nbsp;
</ItemTemplate>
</asp:TemplateColumn>
<asp:HyperLinkColumn   Target= "_parent "   DataNavigateUrlField= "pid "   DataNavigateUrlFormatString= "pshowdetail.aspx?id={0} "
DataTextField= "ptitle "> </asp:HyperLinkColumn>
<asp:TemplateColumn>
<ItemTemplate>
[
</ItemTemplate>
</asp:TemplateColumn>
<asp:BoundColumn   DataField= "ptime "   DataFormatString= "{0:d} "> </asp:BoundColumn>
<asp:BoundColumn   DataField= "phit "> </asp:BoundColumn>
<asp:TemplateColumn>
<ItemTemplate>
<font   color= "#33ff00 "> 次 </font> ]
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
<PagerStyle   Mode= "NumericPages "> </PagerStyle>
</asp:datagrid>
  //page_load()
  if(!this.Page.IsPostBack)
{      
this.toptitle.Text= " <div   align=center> <b> 查询结果如下: </b> </div> ";
this.filldate(gj,lx);
this.DataGrid2.VirtualItemCount=((DataTable)this.Session[ "searchtable "]).Rows.Count;
this.Response.Write(this.DataGrid2.VirtualItemCount);
this.BindGrid();
}
                                    //分页事件
protected   void   DataGrid2_Page(Object   sender,DataGridPageChangedEventArgs   e)  
{
this.DataGrid2.CurrentPageIndex   =   e.NewPageIndex;
startIndex   =   this.DataGrid2.CurrentPageIndex   *   this.DataGrid2.PageSize;
BindGrid();
}
//绑定
private   void   BindGrid()  
{
this.DataGrid2.DataSource   =   CreateDataSource();
this.DataGrid2.DataBind();
}  
                                    //设计器支持所需的方法
private   void   InitializeComponent()
{        

this.DataGrid2.PageIndexChanged+=new   System.Web.UI.WebControls.DataGridPageChangedEventHandler(this.DataGrid2_Page);

this.Load   +=   new   System.EventHandler(this.Page_Load);

}

------解决方案--------------------
不是OnPageIndexChanged事件是PageIndexChanging事件。
protected void grdVendors_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
gridView.PageIndex = e.NewPageIndex;
gridView.DataSource