To declare an enumerated type:

public enum TMyColor
{
  Red,
  Green,
  Blue
}

To convert an enum value to string:

public string GetEnumString(TMyColor obj)
{
     return Enum.GetName(typeof(TMyColor), obj);
}

To convert a string into an enum:

TMyColor mycolor = (TMyColor)Enum.Parse(typeof(TMyColor), "Red");

public enum TMyColor
{
  [Description("Red Color")]
  Red,
  [Description("Green Color")]
  Green,
  [Description("Blue Color")]
  Blue
}

To simply get the enum string equivalent (translate value into string):

//----------------------------------------------------------------------------------------
// Get enum string for the specified object.
//----------------------------------------------------------------------------------------
public static string GetEnumString(TMyColorobj)
{
  return Enum.GetName(typeof(TMyColor), obj);
}

To query an enum value for its description:

using System.ComponentModel;
...
 
//----------------------------------------------------------------------------------------
// Get enum description string for the specified object.
//----------------------------------------------------------------------------------------
public static string GetEnumDescription(Enum value)
{
    System.Reflection.FieldInfo fi = value.GetType().GetField(value.ToString());
 
    DescriptionAttribute[] attributes = (DescriptionAttribute[])fi.GetCustomAttributes(typeof(DescriptionAttribute), false);
 
    if ((attributes != null) && (attributes.Length > 0))
    {
        return attributes[0].Description;
    }
    else
    {
        return value.ToString();
    }
}