My EnumHelper class

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//example of VB call EnumHelper.Parse(Of MenuMode))(sMode)
       public static TEnum Parse<TEnum>(string text) where TEnum : struct
        {
            string sEnum = text;
            ThrowExceptionIfNotEnum<TEnum>();
            if (!Enum.IsDefined(typeof(TEnum), text))
            { // Unfrortunately IsDefined is case sensitive //See also https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=145431
                sEnum = text.ToLower();
                if (!Enum.IsDefined(typeof(TEnum), sEnum))
                {
                    sEnum = text.ToUpper();
                    if (!Enum.IsDefined(typeof(TEnum), sEnum))
                    {
//NOTE that numeric value, passed as string is not recognized by IsDefined, but accepted by Parse. 
//  Debug.Assert(false, String.Format("The value passed ("{0}") is not a defined within {1}.", text, typeof(TEnum).ToString()));
                    }
                }
            }
            TEnum t = (TEnum)Enum.Parse(typeof(TEnum), text, true);
            return t;
        }
        public static List<T> ConvertToList<T>()
        {//from http://rodenbaugh.net/files/folders/18/download.aspx
            List<T> values = new List<T>();
            Array array = Enum.GetValues(typeof(T));
            foreach (T item in array)
                values.Add(item);
 
            return values;
        }
        //from http://rodenbaugh.net/files/folders/18/download.aspx
        public static string[] GetNames<T>()
        {
            return Enum.GetNames(typeof(T));
        }
        //from http://rodenbaugh.net/files/folders/18/download.aspx
        ///<typeparam name="U">usually int</typeparam>
        public static List<U> GetValues<T, U>()
        {
            List<U> values = new List<U>();
            Array array = Enum.GetValues(typeof(T));
            foreach (U item in array)
                values.Add(item);
            return values;
        }
        ///<typeparam name="ValueType">usually int</typeparam>