String reverse

I have come up with some methods by which we can reverse a string. They are as under
Methods1

private string Reverse(string input)
{
	return input.Reverse()
				   .Aggregate(new StringBuilder(), (sb, chars) => sb.Append(chars))
				   .ToString();
}

Methods2

private string Reverse(string input)
{
	return input.Reverse().Aggregate("", (a, b) => a + b);
}

Methods3

private string Reverse(string input)
{
	return new string(input.Reverse().ToArray());
}

Methods4

private string Reverse(string input)
{
	char[] charArray = input.ToCharArray();
	Array.Reverse(charArray);
	return new string(charArray);
}

Methods5

private string Reverse(string input)
{
	int length = input.Length;
	string reverseString = string.Empty;
	for (int i = length; i > 0; i--)
	{
		reverseString += input[i-1];
	}
	return reverseString;
}

The invocation part is as under

var result = Reverse("abcdefghijklmnopqrstuvwxyz");

Hope this will be helpful.