C#

namespace Test
{
    class DefineEnums
    {
        public enum MyEnum
        {
            value1 = 0,
            value2 = 1
        }
    }
    class UseEnums
    {
        public void UseDefinedEnums(DefineEnums.MyEnum _enum)
        { 
            //Any code here.
        }

        public void Test()
        {
            // "value1" comes here with the intellisense.
            UseDefinedEnums(DefineEnums.MyEnum.value1);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Reflection;
using System.Reflection.Emit;

namespace Test
{
    public static class DynamicEnum
    {

        public static Enum finished;
        static List<string> _lst = new List<string>();

        static DynamicEnum()
        {
            _lst.Add("value1");
            _lst.Add("value2");

            finished = CreateDynamicEnum(_lst);
        }

        public static Enum CreateDynamicEnum(List<string> _list)
        {
            // Get the current application domain for the current thread.
            AppDomain currentDomain = AppDomain.CurrentDomain;

            // Create a dynamic assembly in the current application domain, 
            // and allow it to be executed and saved to disk.
            AssemblyName aName = new AssemblyName("TempAssembly");
            AssemblyBuilder ab = currentDomain.DefineDynamicAssembly(
                aName, AssemblyBuilderAccess.RunAndSave);

            // Define a dynamic module in "TempAssembly" assembly. For a single-
            // module assembly, the module has the same name as the assembly.
            ModuleBuilder mb = ab.DefineDynamicModule(aName.Name, aName.Name + ".dll");

            // Define a public enumeration with the name "Elevation" and an 
            // underlying type of Integer.
            EnumBuilder eb = mb.DefineEnum("Elevation", TypeAttributes.Public, typeof(int));

            // Define two members, "High" and "Low".
            //eb.DefineLiteral("Low", 0);
            //eb.DefineLiteral("High", 1);

            int i = 0;
            foreach (string item in _list)
            {
                eb.DefineLiteral(item, i);
                i++;
            }

            // Create the type and save the assembly.
            return (Enum)Activator.CreateInstance(eb.CreateType());
            //ab.Save(aName.Name + ".dll");


        }
    }
}

public static void TestDynEnum(Test.DynamicEnum.finished _finished)
{
    // Do anything here with _finished.
}

// Vul comboboxes
     private void GetVtgMerken()
     {
         txtBrand.DataSource = _Brand.GetVtgBrand();
         txtBran.DisplayMember = "Brand_Name";
         txtBran.ValueMember = "Brand_ID";
     }
     private void GetVtgBrandTypes(int ID)
     {
         txtType.DataSource = _Brandtype.GetVtgBrandTypes(ID);
         txtType.DisplayMember = "type_Naam";
         txtType.ValueMember = "MT_Id";
     }

     // Fill the second combo
     private void txtBrand_SelectedIndexChanged(object sender, EventArgs e)
     {
         // first debug
         textBox1.Text = txtBrand.SelectedValue.ToString();

              // first attempt
              int ID = Convert.ToInt32(txtBrand.SelectedValue.ToString());
              // second attempt
              int ID = Int32.Parse(txtBrand.SelectedValue.ToString());

        // the new select
         GetVtgMerkTypes(ID);
     }