显示来自global.asax的警报消息框(在应用程序错误事件中)

通常,我只是重定向到应用程序错误事件中的自定义错误页,但我有一个特定的错误,当用户仍在触发错误的页上时,我希望显示一条警告消息。我怎样才能做到?

我打开了一个modalpopup或任何其他类型的错误消息,我只想确保用户停留在他们遇到错误的页面上。

谢谢你的意见。

这是对这个线程的引用: A potentially dangerous Request.Form value was detected: Dealing with these errors proactively, or after the fact

以下是我当前使用的代码:

Sub Application_Error(ByVal sender As Object, ByVal e As EventArgs)
    'Code that runs when an unhandled error occurs
    Try
        Dim err As Exception = Server.GetLastError
        If err.Message IsNot Nothing Then
            If err.Message = "The client disconnected." Then
                Dim LogError As New LogError(Server.GetLastError, Session, Request)
                LogError.LogError()
                Response.Redirect("~/TimeoutPage.aspx?id=2")
            ElseIf err.Message.Contains("dangerous Request.Form value") Then
                'Response.Redirect("~/MyInputErrorPage.aspx")
            'Instead the above redirect, I'd like to show the user an alertbox or something similar to explain the error to them
            Else
                Dim LogError As New LogError(Server.GetLastError, Session, Request)
                LogError.LogError()
                Response.Redirect("~/MyErrorPage.aspx")
            End If
        End If
    Catch ex As Exception
    End Try