using System;

public class Program

{

    public enum AlphaType

    {

        A1,

        A2

    }

    public enum BetaType

    {

        B1,

        B2

    }

    public class Item<T>

    {

        public T Value { get; set; }

        public string Foo { get; set;}

    }

    public static void Main()

    {

        var item1 = new Item<AlphaType> { Value =  AlphaType.A1, Foo = "example 1" };

        var item2 = new Item<BetaType> { Value =  BetaType.B1, Foo = "example 2" };

        PrintAlphaFoo(item1);

        PrintAlphaFoo(item2);

    }

    public static void PrintAlphaFoo<T>(Item<T> item)

    {

        if (item.Value == AlphaType.A1)

        {

            Console.WriteLine(item.Foo);

        }

    }

}