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determine if zip is alphanum - C#

private bool ZipIsAnAlphaNum(string zip)
        {

        }

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criteria:

Contains at least one alpha [a thru z]
Contains at least one integer [0 thru 9]

500 points for first to provide working code for the method above in C#.
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ASKER

  public static bool IsValidAlphaNumeric(string inputStr)
        {
            //make sure the user provided us with data to check
            //if not then return false
            if (string.IsNullOrEmpty(inputStr))
                return false;

            //now we need to loop through the string, examining each character
            for (int i = 0; i < inputStr.Length; i++)
            {
                //if this character isn't a letter and it isn't a number then return false
                //because it means this isn't a valid alpha numeric string
                if (!(char.IsLetter(inputStr[i])) && (!(char.IsNumber(inputStr[i]))))
                    return false;
            }

            //we made it this far so return true
            return true;
        }

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