Reverse string of a given input string in C#

This is a simple code using for loop to find out Reverse sting of a given string.

public static string ReverseString(string Str)

    {

        int len = Str.Length;

        StringBuilder revStr = new StringBuilder();

        for (int i = len - 1; i >= 0; i--)

        {

            revStr.Append(Str[i]);

            if (i != 0)

            {

                revStr.Append(' '); // Provide space between each character

            }

        }

        return revStr.ToString();

    }