Substring from text file

[vinsbg]

Hi,
Can someone help me how to substring first 8 digits from number?
I have text file with around 10k lines. Each line contains number with length 12-14 digits. I want to take only first 8 digits from each number and writ it in new file.

Since I'm quite new in programing I have no idea from where to start.

Thank you

[vinsbg]

Ok, I found a solution to this. Please delete this post.

I will do it like this:

 sw.WriteLine(line.Substring(0, Math.Min(line.Length, 8)));

Thank you!