How to get the values of an enum into a SelectList

Question

Imagine I have an enumeration such as this (just as an example):

public enum Direction{
    Horizontal = 0,
    Vertical = 1,
    Diagonal = 2
}

Answer 1

    public static SelectList ToSelectList(this TEnum enumObj) where TEnum : struct
    {
        if (!typeof(TEnum).IsEnum) throw new ArgumentException("An Enumeration type is required.", "enumObj");

        var values = from TEnum e in Enum.GetValues(typeof(TEnum)) select new { ID = (int)Enum.Parse(typeof(TEnum), e.ToString()), Name = e.ToString() };
        //var values = from TEnum e in Enum.GetValues(typeof(TEnum)) select new { ID = e, Name = e.ToString() };

        return new SelectList(values, "ID", "Name", enumObj);
    }
    public static SelectList ToSelectList(this TEnum enumObj, string selectedValue) where TEnum : struct
    {
        if (!typeof(TEnum).IsEnum) throw new ArgumentException("An Enumeration type is required.", "enumObj");

        var values = from TEnum e in Enum.GetValues(typeof(TEnum)) select new { ID = (int)Enum.Parse(typeof(TEnum), e.ToString()), Name = e.ToString() };
        //var values = from TEnum e in Enum.GetValues(typeof(TEnum)) select new { ID = e, Name = e.ToString() };
        if (string.IsNullOrWhiteSpace(selectedValue))
        {
            return new SelectList(values, "ID", "Name", enumObj);
        }
        else
        {
            return new SelectList(values, "ID", "Name", selectedValue);
        }
    }