Reading XML? Use XmlReader, not SqlDataReader

I just know I'm going to want to look this up one day, so here it is for my reference:

If you have SQL that produces XML, you might be tempted to try read that XML using a normal SqlDataReader. But doing it that way will not work if the resulting XML is large. In order to read large XML results from SQL Server, you will need to use the XmlReader rather than the SqlDataReader.