What is the best way to parse (big) XML in C# Code?

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Use XmlReader to parse large XML documents. XmlReader provides fast, forward-only, non-cached access to XML data. (Forward-only means you can read the XML file from beginning to end but cannot move backwards in the file.) XmlReader uses small amounts of memory, and is equivalent to using a simple SAX reader.

    using (XmlReader myReader = XmlReader.Create(@"c:\data\coords.xml"))
    {
        while (myReader.Read())
        {
           // Process each node (myReader.Value) here
           // ...
        }
    }

You can use XmlReader to process files that are up to 2 gigabytes (GB) in size.

Ref: How to read XML from a file by using Visual C#

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