How to read a csv file one line at a time and replace/edit certain lines as you go?

Question

I have a 60GB csv file I need to make some modifications to. The customer wants some changes to the files data, but I don\'t want to regenerate the data in that file because it

Answer 1

Just read the file, line by line, with streamreader, and then use REGEX! The most amazing tool in the world.

using (var sr = new StreamReader(new FileStream(@"C:\temp\file.csv", FileMode.Open)))
        {
            var line = sr.ReadLine();
            while (!sr.EndOfStream)
            {
                // do stuff

                line = sr.ReadLine();
            }

        }