Loading big text files

Question

I have to load a textfile into my software, which can be really big (at least 1.5 GB), because I need to read the last line of this file to enumerate some elements with the next part of the script. The needed time can be very long but, sometimes, it is not possible to read the file because of the following error:

System.OutOfMemoryException: 'Array dimensions exceeded supported range.'

Is there a way to solve this issue? Or maybe a different - and better - path that I can follow to do what I need?

EDIT I: Here follows more details:

• I'm generating the aforementioned textfile from a batch-script which is run from the software of mine by pressing a button

• Since I need to read a number contained in the last row of the generated textfile, I'm loading the file into the software, the pressure of a button is needed and for the relative Sub I'm using the following command:

  Dim path as string

  path = "C:\textfile.txt"

  RichTextBox1.LoadFile(path, RichTextBoxStreamType.PlainText)

Answer 1

If you only need the last line of the file...

Dim LastLine = File.ReadLines("file.txt").Last()