How to remove lines from a text file?

Question

C++ / C#

For example, player 1 was in 5th place, and some next player 2 broke this record and became in 5th place, and player 1 in 6th place, you need to remove the player who is in 6th place from a file!
this code has a dictionary - key - player name, value - time in seconds (less is better)
All results (key and value) are written to a file in a different form, and in this form they are copied to the dictionary and scrolled from the dictionary by label as the end result, but I can't remove the players from the file that left the rating.
How to delete this player in a file?

private static Dictionary<string, int> AllNames()
    {
        return File
          .ReadLines(@"C:\Users\HP\Desktop\картинки\results.txt")
          .Where(line => !string.IsNullOrWhiteSpace(line))
          .Select(item => item.Split(' '))
          .ToDictionary(items => items[0],
                        items => int.Parse(items[1]));
    }


    private void updateRatingLabels()
    {
        var tops = AllNames()
          .OrderBy(pair => pair.Value)                      
          .ThenBy(pair => pair.Key, StringComparer.Ordinal) 
          .Take(5)                                           
          .ToArray();


        for (int i = 18; i <= 22; ++i)
            Controls.Find($"label{i}", true).First().Text = "";

        for (int i = 28; i <= 32; ++i)
            Controls.Find($"label{i}", true).First().Text = "";


        for (int i = 0; i < tops.Length; ++i)
        {
            Controls.Find($"label{i + 18}", true).First().Text = tops[i].Key;
            Controls.Find($"label{i + 28}", true).First().Text = $"{tops[i].Value / 60}:{tops[i].Value % 60:00}";
        }
    }

Answer 1

Read all lines from a file into memory. In memory, delete those lines that you need to delete.
Write back the list of strings to the file.

var lines = File.ReadAllLines("lines.txt").ToList();
lines.RemoveAt(indexToRemove);
File.WriteAllLines("lines.txt", lines);