What is the fastest way to combine two xml files into one

The easiest way to do this is using LINQ to XML. You can use either Union or Concat depending on your needs.

var xml1 = XDocument.Load("file1.xml");
var xml2 = XDocument.Load("file2.xml");

//Combine and remove duplicates
var combinedUnique = xml1.Descendants("AllNodes")

//Combine and keep duplicates
var combinedWithDups = xml1.Descendants("AllNodes")

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