Could not find path ....
To me the error simply says that the file does not exists on the path defined. Please make sure that the file is present in the location as defined.
Might me 'space' between the Form & Data words creating an issue OR you don't have the access priviledge to create a file at that location. Try at some other place.
XmlReader xmlRdr = XmlReader.Create(@"C:\Form Data.xml");
XmlReader xmlRdr = XmlReader.Create(@"D:\ChangedDrive\FormData.xml");