using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        List<InvBase> strategies = new List<InvBase>{new GentInvRepo(), new EssarInvRepo()};

        var input = Brand.Gent;

        var strategy = strategies.FirstOrDefault(p => p.Brand == input);

        Console.WriteLine(strategy.Execute(""));

    }

​

    public enum Brand

    {

        Gent,

        Essar

    }

​

    public abstract class InvBase

    {

        public abstract Brand Brand

        {

            get;

        }

​

        public abstract string Execute(string brand);

    }

​

    public class GentInvRepo : InvBase

    {

        public override Brand Brand => Brand.Gent;

        public override string Execute(string brand)

        {

            return "this is gent object";

        }

    }

​

    public class EssarInvRepo : InvBase

    {

        public override Brand Brand => Brand.Essar;

        public override string Execute(string brand)

        {

            return "this is essar object";

        }

    }

}