Read/Write to text file

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

namespace MarchNine
{
    class Program
    {
        static void Main(string[] args)
        {
            //text file path
            string textFilePath = FilePath.GetFilePath();

            bool continueProgram;

            do
            {
                continueProgram = true;
                StandardMessages.DetermineTask();
                string taskInput = Console.ReadLine();

                if (taskInput.Equals("Add", StringComparison.OrdinalIgnoreCase))
                {
                    //Get user input for the lines, then append them to the list.
                    List<string> lines = DataEntry.UserInput();
                    File.AppendAllLines(textFilePath, lines);
                }
                else if (taskInput.Equals("Read", StringComparison.OrdinalIgnoreCase))
                {
                    ReadText.Read();
                }
                else if (taskInput.Equals("Exit", StringComparison.OrdinalIgnoreCase))
                {
                    continueProgram = false;
                }
                else
                {
                    StandardMessages.TaskError();
                }

            } while (continueProgram == true);

            StandardMessages.EndApplication();
        }
    }
}

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

namespace MarchNine
{
    static class FilePath
    {
        public static string GetFilePath()
        {
            //static method that returns the specified file path
            return @"C:\temp\monday string.txt";
        }
    }
}

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

namespace MarchNine
{
    class DataEntry
    {
        //Method that takes user input, puts it in a list, and then retuns that list to the caller
        public static List<string> UserInput()
        {
            List<string> output = new List<string>();

            bool addMoreEntries = true;

            do
            {
                //Get user input from user
                Console.Write("Enter text to be stored: ");
                string readInput = Console.ReadLine();

                //Get date to add to string
                DateTime date = DateTime.Now;

                //Add user input to list
                output.Add($"{readInput}\t\t (written at {date : MM-dd-yyyy HH:mm:ss})" );

                //Ask user to continue, if yes continue loop. if no exit.
                Console.WriteLine("Add more entries? (Y/N)");
                string addMoreEntriesInput = Console.ReadLine();

                if (addMoreEntriesInput != "Y" && addMoreEntriesInput != "y")
                {
                    addMoreEntries = false;
                }

            } while (addMoreEntries == true);


            return output;

        }

    }
}

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

namespace MarchNine
{
    class ReadText
    {
        public static void Read()
        {
            //Gets file path and then writes out content of the path to Console.
            string textFilePath = FilePath.GetFilePath();

            string displayText = File.ReadAllText(textFilePath);
            Console.WriteLine("Current entries:\n");
            Console.WriteLine(displayText);
        }
    }
}

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

namespace MarchNine
{
    class StandardMessages
    {
        public static void DetermineTask()
        {
            Console.WriteLine("What would you like to do?");
            Console.WriteLine(@"Enter ""Add"" to add lines, ""Read"" to read lines, or ""Exit"" to exit program");
        }

        public static void EndApplication()
        {
            Console.WriteLine("Program Complete");
            Console.ReadLine();
        }

        public static void TaskError()
        {
            Console.WriteLine("Entry not recognized. Please enter a correct task");
        }
    }
}