如何在c＃，asp.net mvc 3中反序列化未知的大型xml文件？

I've almost written a "webstore" asp.net mvc 3 app and I want to populate my database with some items from one web store. They provide information about items for their partners in an xml files. I've downloaded one but it's of 150 MB, so I can't just open it and look through the content. I've almost written a "webstore" asp.net mvc 3