Question

Using Server.Transfer to show a page that informs the user that the web site is at maintenance mode.
At global.asax:

void Application_BeginRequest(object sender, EventArgs e)
{
    if (Request.IsLocal)
        return;

    if (ConfigurationManager.AppSettings["MaintenanceMode"] == "true")
    {
        if (Request.AcceptTypes != null && Request.AcceptTypes[0] == "text/html")
            Server.Transfer("~/UserMessage.aspx?Maintenance");
    }
}  

Works well except when looking at the page source code I see that the CSS path has been updated but images’ paths are not.
Any suggestions?

Answer 1

I would use app_offline.htm in the application root or at the very least Response.Redirect if I were you, Server.Transfer does not change the HTTP address, so you have to be careful redirecting all assets to the underlying page or make all addresses absolute