exception in c#.net

[moshesade]

i don't understand why the program throw exception?
this method need to convert haxdecimal to simple string without 0x

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;

namespace hexdecimal
{
    class Program
    {
        static void Main(string[] args)
        {
            string cleanInput;
            Console.WriteLine("insert hexdecimal number");
            string hd = Console.ReadLine();
            cleanInput = GetHexStringWithout0x(hd);
            Console.WriteLine("the values is {0}",cleanInput);       
        }

        private static string GetHexStringWithout0x(string input)
        {
            string answer;
            char[] hn = new char[input.Length];
            hn = input.ToCharArray(2, input.Length);
            answer = new string(hn);
            return answer;
        }       
    }
}

[tlhintoq]

TIP: When you are writing your question, there is a button on the tool bar that wraps the [code] tags around your copy/pasted code. It helps a bunch. Its the button with a '#' on it. More on tags. They're cool. Check'em out.

[tlhintoq]

Where does it throw the exception? (what line)
What is the actual error?

I do notice that line 24 might be a problem
If your input.length is 30
and you start at position 2, for a length of 30
then you would have to have 32 elements to put into hn

[moshesade]

if you help me

how do i solve a problem?

[tlhintoq]

Don't try to grab the full length if you are starting someplace other than 0.
You have to grab a length that is your full length minus your starting position.

 private static string GetHexStringWithout0x(string input, int StartPos)
        {
            string answer;
            char[] hn = new char[input.Length];
            hn = input.ToCharArray(StartPos, input.Length - StartPos);
            answer = new string(hn);
            return answer;
        }

[Plater]

If your goal is to just remove the 0x from the start of your string everytime:
[code=c#]
private static string GetHexStringWit hout0x(string input, int StartPos)
{
string retval = input;
if (input.StartsWi th("0x", StringCompariso n.InvariantCult ureIgnoreCase)) retval = input.Substring (2);
return answer;
}
[/code]