Large text log file management

I have a large (>50,000 lines) text log file that I would like to "copy" the last n lines from, into another, new text file.

I would rather not read the whole log file into an array simply to save the last n lines out to a new file, it seems very processor intensive for that result.

Can anyone think of a way I can get the last n lines from a text file this large?

Many thanks

Umm , have a look at StreamReader(or FileStream) class . I think I've seen one of the overloaded function that can read from specific position .