添加该代码后，它就适用于所有浏览器

After adding this one it''s work for all browsers

if (Request.UserAgent.IndexOf("AppleWebKit") > 0)
{
Request.Browser.Adapters.Clear();
}

对于IE8 ...
在StyleSheet中添加CSS专业知识

for IE8...
Add css Proferty in StyleSheet

.IE8Fix
{
    z-index: 1000;
}

并按如下所示添加css属性...

and add the css property as follows...

<asp:Menu runat="server" >
  <DynamicMenuStyle CssClass="IE8Fix" />
</asp:Menu>

您好，
尝试在兼容性视图中使用浏览器.
请注意，这仅适用于Internet Explorer.
要以兼容性方式查看它，请转到工具"->兼容性视图".

Hi there,
Try using the browser in compatibility view.
Note this is for Internet Explorer only.
To view it in compatibility go to Tools-> compatibility View.