C# .NET - server.mappath

I am having xml file in my project.
Consider my file is in Errorlog foder.(means /Errorlog/file.xml).

I have to load my xml file in application.  How to write this code. 

XmlDocument document = new XmlDocument();
    document.Load(Server.MapPath("../Errorlog/Errorlogfile.xml"));


I dont know.

Just use root addressing

document.Load(Server.MapPath("/ErrorLog/file.xml"));