reverse string in c#

                                    string str = "Hello World!"; // the string which you want to reverse
string reverse = "";
int length = str.Length - 1; 

while(length >= 0)
{
	reverse += str[length];
   	length--;
}

Console.WriteLine(reverse);  // output: "!dlroW olleH"

                                     Console.WriteLine("Enter Sequence of on number");
            string seqnumber = Console.ReadLine().ToString();
            string reverseseqnumber = "";
            if (seqnumber.Length == 0) { Console.WriteLine("no input is provided"); }
            if(seqnumber.Length>0)
            {
                for(int i=0;i<seqnumber.Length;i++)
                {
                    reverseseqnumber += seqnumber[(seqnumber.Length-1)-i];
                }
                Console.WriteLine("original value : " + seqnumber + " reverse value :" + reverseseqnumber);             
            }
            else
            {
                Console.WriteLine("Print input in reverse order : " + seqnumber);
            }
            Console.ReadLine();

                                    
---------------------------------------------------Option 1
foreach (int v in values.Select(x => x).Reverse())
{
      Console.Write(v + " ");
}
---------------------------------------------------Option 2
       public static void Main(string[] args)
        {
            Console.Write( Reverse("ABcdefgH") );
        }

		public static string Reverse(string s)
        {
            string result = String.Empty;
            char[] cArr = s.ToCharArray();
            int end = cArr.Length - 1;

            for (int i = end; i >= 0; i--)
            {
                result += cArr[i];
            }
            return result;
        }

                                    public static string ToReverseString(this string value)
{
  return string.Join("", value.Reverse());
}

public static string SubstringReverse(this string value, int indexFromEnd, int length)
{
  return value.ToReverseString().Substring(indexFromEnd, length).ToReverseString();
}

                                    public static void Main(string[] args)
        {
            string s = "aeiouXYZ";
           Console.Write(Reverse(s) );
        }

        public static string Reverse(string s)
        {
            var result = new string(s.ToCharArray().Reverse().ToArray() );
            return result;
        }
------------------------------------------------------Option 2
foreach (int v in values.Select(x => x).Reverse())
{
      Console.Write(v + " ");
}