Read a large (900 Mb) xml file

I need to read a very large xml file (900 Mb)
(I'am using XmlReader.Create)

Now i'd like to add an option to my app to read only 100000 elements at a time
For example use a button 'Next' to read the next 100000 elements.
(For reading the first 100000 elements i used a for loop)

How do i do this ?