c# linq sequence contains no elements

gistfile1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace Test.linq
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        public List<Cars> myCars = new List<Cars>{
            new Cars(){Name="Honda",Color="Red"},
             new Cars(){Name="Nisan",Color="Red"},
              new Cars(){Name="Toyota",Color="Silver"},
              new Cars(){Name="BMW",Color="Black"}
            };
        protected void Page_Load(object sender, EventArgs e)
        {
            //Find my car color from myCars list
            int iIndex = 0;
            //First i am checking whether my Car is exist or not in myCars list.
            var idump = myCars.FirstOrDefault(p => p.Name == "Honda");

            //If exist it will not be null or it will be null
            if (idump != null)
            {
                iIndex = myCars.Select((Value, Index) => new { Value, Index }).Single(p => p.Value.Name == "Honda").Index;
            }
            else
            {
                iIndex = -1;
            }
            if (iIndex != -1)
            {
                string strCarColor = myCars[iIndex].Color.ToString();
                Response.Write("Your car color" + strCarColor);
            }
            else
            {
                Response.Write("Your car is no available.");
            }
        }
    }
    public class Cars
    {
        public string Name { get; set; }
        public string Color { get; set; }
    }
}