小编rom*_*man的帖子

我需要C#中的示例代码,以在完成的pdf文档的所有页面上插入背景图像.我正在使用iTextSharp库.

我的代码:

*的.aspx:

<asp:DropDownList ID="CountryList" CssClass="CountryList" runat="server" 
           OnSelectedIndexChanged="CountryList_SelectedIndexChanged" />

*.aspx.cs:

protected void Page_Load(object sender, EventArgs e)
{
   CountryList.SelectedIndexChanged += 
                          new EventHandler(CountryList_SelectedIndexChanged);
   ...  
}

protected void CountryList_SelectedIndexChanged(object sender, EventArgs e)
{
   LoadCityList(CountryList, CityList);
}

但这不起作用.