Splitting a large XML file in two using C# console app?

The "best" way is likely to be based on XmlReader and XmlWriter . Using these "streaming" APIs avoids needing to load the whole XML object model in memory (and with DOM – XmlDocument – that can need considerably more memory than the text data).

You might want to consider making a full copy of the file and then deleting elements from each. You will have to decide at what level the deletions could occur.

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