Simple Enum Parsing, C#

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/**
 * 2017-01-27 CoderHead
 * This class accepts a <see cref="System.String"/> value and attempts to parse it as an <see cref="System.Enum"/>
 * in a safe way, accommodating custom values that don't conform to enum member names or int values.
 */
using System;

namespace Rextester
{
    /// <summary>
    /// Enum values to be parsed.
    /// </summary>
    internal enum SampleValues
    {
        // Because there's no 0 (zero) member, .NET automatically creates a default and won't error on parse. Beware of zero!
        One = 1,
        Four = 4,
        Five = 5,
        Thirteen = 13,
        Fourteen = 14,
        Eighteen = 18,
        ThirtyFour = 34,
        ThirtyNine = 39,
        SixtyThree = 63,
        EssBee,
        SeventyTwo = 72,
        SeventySix = 76,
        EightyFive = 85,
        EightySix = 86,
        Ninety = 90,
        NinetyOne = 91,
        NinetyFour = 94,
        NinetyFive = 95
    }
    
    /// <summary>
    /// Main entry point for the application.
    /// </summary>
    public static class Program
    {
        #region Methods
            
        /// <summary>
        /// Main entry method for the application.
        /// </summary>
        public static void Main(string[] args)
        {
            var rawValue = "0";
            Console.WriteLine(ParseRawValue(rawValue));
            
            rawValue = "One";
            Console.WriteLine(ParseRawValue(rawValue));
            
            rawValue = "005";
            Console.WriteLine(ParseRawValue(rawValue));
            
            rawValue = "0x001";
            Console.WriteLine(ParseRawValue(rawValue));
            
            rawValue = "thirteen";
            Console.WriteLine(ParseRawValue(rawValue));
            
            rawValue = "sb";
            Console.WriteLine(ParseRawValue(rawValue));
        }
        
        /// <summary>
        /// Parses the raw value into an enum, if possible, and returns a string containing the results.
        /// </summary>
        /// <param name="rawValue">A String value containing the code to be parsed.</param>
        /// <returns>A String value containing user-readable results of the parsing attempt.</returns>
        private static string ParseRawValue(string rawValue)
        {
            var returnValue = string.Empty;
            
            int parsedValue;
            if (int.TryParse(rawValue, out parsedValue))
            {
                returnValue += "The numeric value (" + rawValue + ") is: " + parsedValue.ToString() + ".\r\n";
            }
            else
            {
                returnValue += "The raw value (" + rawValue + ") is not numeric.\r\n";
            }
            
            var enumValue = rawValue.ToSampleValue();
            if (enumValue.HasValue)
            {
                returnValue += "The enum value is: " + enumValue.Value.ToString() + ".\r\n";
            }
            else
            {
                returnValue += "The raw value (" + rawValue + ") is not an enum member.\r\n";
            }
            
            return returnValue;
        }
        
        #endregion
    }
    
    /// <summary>
    /// Contains extension methods for strings.
    /// </summary>
    internal static class StringExtensions
    {
        #region Methods

/// <summary>
        /// Map a raw value to a <see cref="SampleValues"/> enum value.
        /// </summary>
        /// <param name="rawValue">A String value containing the raw value.</param>
        /// <returns>A <see cref="Nullable{SampleValues}"/> member containing the sample value if valid; otherwise, null.</returns>
        internal static SampleValues? ToSampleValue(this string rawValue)
        {
            if (string.IsNullOrWhiteSpace(rawValue))
            {
                return null;
            }
            
            SampleValues parsedEnumValue;
            // Case-insensitive parsing of string value against enum member name or int value:
            if (!Enum.TryParse(rawValue.Trim(), true, out parsedEnumValue) || !Enum.IsDefined(typeof(SampleValues), parsedEnumValue))
            {
                // This should be moved into a lookup or custom TypeConverter(?) of some sort:
                if ("SB".Equals(rawValue.Trim(), StringComparison.InvariantCultureIgnoreCase))
                {
                    parsedEnumValue = SampleValues.EssBee;
                }
                else
                {
                    return null;
                }
            }

return parsedEnumValue;
        }
            
        #endregion
    }
}

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Compilation time: 0,12 sec, absolute running time: 0,09 sec, cpu time: 0,08 sec, average memory usage: 12 Mb, average nr of threads: 3