How to remove text from a specific line in file without creating unwanted space using C#?

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C#

I'm trying to remove text from a specific line in the file that i have created "Test.txt".

Here is the text written in Test.txt:
1
2
3
4
5
6
7
8
9
10

Now what i want to happen is when i'm going to remove 1-5, the numbers 6 - 10 should replace the line for 1-5. Like this:
6
7
8
9
10

But when i tried the code it gave me this output:





6
7
8
9
10

As you can see the above output, that is the unwanted space that i'm talking about.

What I have tried:

Here is the code that I have tried:

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace TestCode
{
class Program2
{
    static void Main()
    {
        lineChanger("", @"C:\Users\User1\Documents\Visual Studio 2015\WebSites\MusicStore\Pages\Test.txt", 1);
        lineChanger("", @"C:\Users\User1\Documents\Visual Studio 2015\WebSites\MusicStore\Pages\Test.txt", 2);
        lineChanger("", @"C:\Users\User1\Documents\Visual Studio 2015\WebSites\MusicStore\Pages\Test.txt", 3);
        lineChanger("", @"C:\Users\User1\Documents\Visual Studio 2015\WebSites\MusicStore\Pages\Test.txt", 4);
        lineChanger("", @"C:\Users\User1\Documents\Visual Studio 2015\WebSites\MusicStore\Pages\Test.txt", 5);
    }

    static void lineChanger(string newText, string fileName, int line_to_edit)
    {
        string[] arrLine = File.ReadAllLines(fileName);
        arrLine[line_to_edit - 1] = newText;
        File.WriteAllLines(fileName, arrLine);
    }
}
}

Also please feel free to suggest any proper techniques and kindly include actual examples.