XmlDocument Loading xml file Problem

hi

i am loading xml file in this way it is giving me an exception(Name cannot begin with the '"' character, hexadecimal value 0x22. Line 4, position 25.) but i did not get it how can i solve this can  any one help me...?

 XmlDocument doc = new XmlDocument();
 doc.Load(Server.MapPath("~/App_Data/XMLFile.xml"));