Asp.net页面弹出框时，底部背景图片部分不显示

解决方法：

1.加

<asp:ScriptManager ID="ScriptManager1" EnablePageMethods="true" AsyncPostBackTimeout="480"

OnAsyncPostBackError="ScriptManager1_AsyncPostBackError" runat="server" EnableScriptGlobalization="true"

EnableScriptLocalization="true">

</asp:ScriptManager>

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">

<ContentTemplate>

</ContentTemplate>

</asp:UpdatePanel>

2、后台加如下代码：

protected void ScriptManager1_AsyncPostBackError(object sender, AsyncPostBackErrorEventArgs e)

{

ScriptManager1.AsyncPostBackErrorMessage = e.Exception.Message + "\n\n[" + e.Exception.StackTrace + "]";

}

3、在需要弹出框的位置

ScriptManager.RegisterStartupScript(this.Page, this.GetType(), "dele", "alert('验证码输入错误，请重新输入。');", true);