Fastest way to add new node to end of an xml?

Question

I have a large xml file (approx. 10 MB) in following simple structure:

   .......
   .......         


        

Answer 1

The fastest way would probably be a direct file access.

using (StreamWriter file = File.AppendText("my.log"))
{
    file.BaseStream.Seek(-"".Length, SeekOrigin.End);
    file.Write("   New error message.");
}

But you lose all the nice XML features and may easily corrupt the file.