关于c＃：UpdatePanel中的按钮触发事件，但页面不更新

Button in UpdatePanel triggers event, but the page doesn't update

标记如下：

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<ContentTemplate>

<form class="navbar-form pull-left">

<br />

</form>

</ContentTemplate>
<Triggers>

</Triggers>
</asp:UpdatePanel>

<button id="Button1" runat="server" type="button" class="close" data-dismiss="alert">×</button>
You shouldn't see this message!

</asp:Panel>
</asp:Panel>

单击btnupload按钮时，服务器代码应该确定fileupload控件是否有文件。如果是这样，它会将面板控件的可见性更改为true。它在更新面板之外工作正常。

服务器代码如下：

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protected void btnUpload_Click(object sender, EventArgs e)
{
this.SetMessage(Message.Success);
try
{
if (this.test.HasFile)
{
string filename = Path.GetFileName(GetUB04Doc.FileName);
//test.SaveAs(Server.MapPath("~/") + filename);
this.SetMessage(Message.Success);
}
}
catch (Exception ex)
{
//TODO: Do something with th exception
this.SetMessage(Message.Fail);
}
finally
{
//this.GetUB04Doc.Dispose();
}
}
private enum Message { Success, Fail }
private void SetMessage(Message msg)
{
if (msg == Message.Success)
{
this.divAlert.InnerText ="Well done! The document appears to have uploaded successfully. Please wait...";
this.divAlert.Attributes.Add("class","alert alert-success");
}
else
{
this.divAlert.InnerText ="Oh snap! Something broke. Please contact IT right away.";
this.divAlert.Attributes.Add("class","alert alert-error");
}

this.panAlert.Visible = true;
}

我也尝试将面板放入ContentTemplate部分，但结果是相同的。

对我在这里做错了什么有什么看法吗？