How to overwrite the last line of text file

Question

FileStream files = new FileStream("text.txt", FileMode.Append, FileAccess.Write);                       
StreamWriter cmdswriter = new StreamWriter(files);
cmdswriter.Write("last line content");

Answer 1

If your file is not too large:

string path = "text.txt";
var fileContent = File.ReadLines(path).ToList();

fileContent[fileContent.Count - 1] = "last line content";
File.WriteAllLines(path, fileContent);