Custom MyStrings Class implementation in C Sharp

Hi everyone. I am new to programming. I need your help regarding the creation of Custom MyStrings class in C Sharp which mimics the behaviour of String class. I have tried the following code but it is not giving proper output as expected. Please help me through this . Many thanks

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

namespace CP
{ 
    internal class MyStrings
    {
        #region(Fields)        

        #endregion
        #region(Properties)

        #endregion
        #region(Constructors)

        #endregion
        #region(Index operator)        

        #endregion
        #region(Implicit convertors)        

        #endregion
        #region(Methods)

        #endregion
        #region(Operators)
        #endregion

        public  char[] chars;

       
         
        // Constructor that takes no argument
        public MyStrings()
        {
            chars = new char[0];
        }

        // Index operator
        public char this[int index]
        {
            get { return chars[index]; }
            set { chars[index] = value; }
        }

        // Constructor that takes a single character
        public MyStrings(char c)
        {
            chars = new char[] { c };
        }

        // Constructor that takes an array of characters
        public MyStrings(char[] input)
        {
            chars = input;
        }

        // Write() method
        public void Write()
        {
            Console.WriteLine(chars);
        }

        public int Length
        {
            get { return chars.Length; }
        }

        //  operator that concatenates two MyStringss
        public static MyStrings operator +(MyStrings s1, MyStrings s2)
        {
            char[] newChars = new char[s1.Length + s2.Length];
            Array.Copy(s1.chars, newChars, s1.Length);
            Array.Copy(s2.chars, 0, newChars, s1.Length, s2.Length);
            return new MyStrings(newChars);
        }

        // ToCharArray() method
        public char[] ToCharArray()
        {
            char[] newChars = new char[chars.Length];
            Array.Copy(chars, newChars, chars.Length);
            return newChars;
        }

        // Implicit conversion from MyString to string
        public static implicit operator string(MyStrings s)
        {
            return new string(s.chars);
        }

        // Implicit conversion from string to MyStrings
        public static implicit operator MyStrings(string s)
        {
            return new MyStrings(s.ToCharArray());
        }

        // Implicit conversion from char[] to MyStrings
        public static implicit operator MyStrings(char[] chars)
        {
            return new MyStrings(chars);
        }


        // ToLower() method

        public MyStrings ToLower()
        {
            char[] result = new char[Length];

            for (int i = 0; i < Length; i++)
            {
                char c = chars[i];

                if (c >= 'A' && c <= 'Z')
                {
                    // Convert uppercase letter to lowercase letter
                    c = (char)(c - ('A' - 'a'));
                }

                result[i] = c;
            }

            return new MyStrings(result);
        }



        // ToUpper() method
        public MyStrings ToUpper()
        {
            char[] result = new char[Length];

            for (int i = 0; i < Length; i++)
            {
                char c = chars[i];

                if (c >= 'a' && c <= 'z')
                {
                    // Convert lowercase letter to uppercase letter
                    c = (char)(c - ('a' - 'A'));
                }

                result[i] = c;
            }

            return new MyStrings(result);
        }

        // Equals() method override
        public override bool Equals(object obj)
        {
            if (obj == null || GetType() != obj.GetType())
            {
                return false;
            }

            MyStrings other = (MyStrings)obj;

            if (Length != other.Length)
            {
                return false;
            }

            for (int i = 0; i < Length; i++)
            {
                if (chars[i] != other[i])
                {
                    return false;
                }
            }

            return true;
        }
        // Reverse() method
        public MyStrings Reverse()
        {
            char[] result = new char[Length];

            for (int i = Length - 1, j = 0; i >= 0; i--, j++)
            {
                result[j] = chars[i];
            }

            return new MyStrings(result);
        }


        public static void Main(string[] args)
        {
            MyStrings s = new MyStrings();
            Console.WriteLine("Should print nothing: {0}", s);

            // Create a constructor that takes array of characters 
            char[] a = { 'M', 'y', ' ', 'n', 'a', 'm', 'e' };
            MyStrings s2 = new MyStrings(a);
            Console.WriteLine("Should print 'My name': {0}", s2);

            // Write an operator '+' that concatenates two MyStrings
            MyStrings s3 = s + s2;
            Console.WriteLine("Should print 'My name': {0}", s3);
            s3 = s2 + " " + s3;
            Console.WriteLine("Should print 'My name My name': {0}", s3);

            string s4 = "Hey, " + s3; // S3 is MyStrings. Should use implicit convertor.
            Console.WriteLine("Should print 'Hey, My name My name': {0}", s4);

            Console.WriteLine("Printing s3: {0}", s3);
            Console.WriteLine("Should print 'M': {0}", s3[8]);
            char[] a2 = s3.ToCharArray();
            Console.WriteLine("Should print 'M': {0}", a2[8]);

            MyStrings s5 = new MyStrings("ABC".ToCharArray());
            Console.WriteLine("Should print 'ABC': {0}", s5);
            s5.ToLower();  //note s5 doesn't change
            MyStrings s6 = s5.ToLower();
            Console.WriteLine("Should print 'ABC': {0}", s5);
            Console.WriteLine("Should print 'abc': {0}", s6);
            Console.WriteLine("Should print 'ABC': {0}", s6.ToUpper());

            s5 += s6;  //note we get this operator for free
            Console.WriteLine("Should print 'ABCabc': {0}", s5);

            Console.WriteLine("Should print 'True': {0}", s5.Equals(s5));
            Console.WriteLine("Should print 'False': {0}", s5.Equals(s6));

            MyStrings s7 = new MyStrings("ZYX".ToCharArray());
            MyStrings s8 = new MyStrings("ZYX".ToCharArray());
            Console.WriteLine("Should print 'True': {0}", s7.Equals(s8));

            MyStrings s9 = s5.Reverse();
            Console.WriteLine("Should print 'cbaCBA': {0}", s9);
            Console.WriteLine("Should print 'ABCabc': {0}", s9.Reverse());
        }

    }
}

But I am not getting the expected output as commented in the main method . 

Please help me where is the issue with the code snippet. Thanks in advance.