using System;
using System.Globalization;
using System.Numerics;
public class Example
{
public static void Main()
{
string[] hexStrings = { "80", "0080", "00E293", "00F9A2FF", "00FFFFFFFF" };
foreach (string hexString in hexStrings)
{
BigInteger number = BigInteger.Parse(hexString, NumberStyles.AllowHexSpecifier);
Console.WriteLine("Converted 0x{0} to {1}.", hexString, number);
}
}
}