Convert hex to decimal

using System;
//Write a program to convert hexadecimal numbers to their decimal representation
class Program
{
    static void Main()
    {
        Console.WriteLine("Enter hex number : ");
        string convert = Console.ReadLine();

        convert = convert.ToLower();
        int result = 0;

        for (int i = convert.Length - 1, reverse = 0; i >= 0 ; i--,reverse ++)
        {
            if (convert[i] <= '9')
            {
                result += (convert[i] - '0') * (int)Math.Pow(16,reverse) ;
            }
            else if (convert[i] <= 'f')
            {
                result += (convert[i] - 'a' + 10) * (int)Math.Pow(16, reverse);
            }
        }
        Console.WriteLine("Converted number :");
        Console.WriteLine(result);
    }
}