C# ToString() Method

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Can someone tell me if I am on the right track with these instructions? Can someone help me with the ToString() step? I am new to C#

Create an application class named LetterDemo that instantiates objects of two classes named Letter and CertifiedLetter and that demonstrates all their methods.

The classes are used by a company to keep track of letters they mail to clients. The Letter class includes auto-implemented properties for the Name of the recipient and the Date mailed (stored as strings).

Create a child class named CertifiedLetter that includes an auto-implemented property TrackingNumber (of type string) that holds a tracking number for the letter.

Next, include a ToString() method that overrides the Object class’s ToString() method and returns a string that contains the name of the class (using GetType()) and the respective class’s data field values. Use default, empty constructor for both classes.

using System;
using static System.Console;
using System.Globalization;
class LetterDemo
{
    static void Main()
    {
        class LetterDemo
        {
            static void Main(string[] args)
            {
                LetterObject = new Letter(); 
                CertifiedLetter = new CertifiedLetter()
            }
        }

        
        public class  Letter()
        {
            
            // Set the class properties 
            private string name;
            private string dateMailed; 

            // Get set methods 
            public string Name
            {
                get {return name; }
                set { name = value; }
            }

            // Property for DateMailed 
            public string DateMailed 
            {
                get {return dateMailed; }
                set {dateMailed = value; }
            }

            // Override the ToString() method 
            public ovveride string ToString()
            {
                return $"Name {Name}, 
            }
        }

        public class  CertifieddLetter : Letter
        {
            
            public string TrackingNumber {get; set}; 


        }
    }
}