Write to file not working (StreamWriter)

using System;
using System.Numerics;
using System.Text;
using System.IO;
namespace Username
{
    class Program
    {
        static void Main()
        {
            bool end = false;
            string filePath = @"C:\Users\Administrator\Desktop\HEXes.txt";

            StreamWriter hap = new(filePath, false, Encoding.Unicode);
            
            hap.WriteLine($"{F:N0} is {F:X}"); // there are variables I didn't mention, I just wanted to show here I write to file

            hap.Close();
            Console.ForegroundColor = ConsoleColor.Yellow;
            Console.Write("\nPress any key to continue...");
            Console.ReadKey();
        }
    }
}