read only given last x lines in txt file [duplicate]

Answer 1

You can use ReadLines to avoid reading the entire file into memory, like this:

const int neededLines = 5;
var lines = new List();
foreach (var s in File.ReadLines("c:\\myfile.txt")) {
    lines.Add(s);
    if (lines.Count > neededLines) {
        lines.RemoveAt(0);
    }
}

Once the for loop is finished, the lines list contains up to the last neededLines of text from the file. Of course if the file does not contain as many lines as required, fewer lines will be placed in the lines list.