public class Class1
{
    private string name;

    public string Name {
        get { return name; }
        set { name = value; }
    }

    public override bool Equals(Object obj) {
        if (obj == null)
            return false;
        Class1 c = obj as Class1;
        if (! (c is Class1))
            return false;
        return (Name == c.Name);
    }
}

class Program
{
    static void Main(string[] args) {
        Test2();
    }
    private static void Test2() {
        List<Class1> list = new List<Class1>();

        list.Add(new Class1 { Name = "1" });
        list.Add(new Class1 { Name = "2" });
        list.Add(new Class1 { Name = "3" });
        list.Add(new Class1 { Name = "4" });
        list.Add(new Class1 { Name = "5" });

        Console.WriteLine("i\tvalue");

        for (int j = 0; j < list.Count; j++) {
            Console.WriteLine("{0}\t{1}", j, list[j].Name);
        }

        int correct = 2;
        Class1 temp = new Class1 {Name = "3"};

        if (correct == list.IndexOf(temp)) {
            Console.WriteLine("true");
            Console.WriteLine("{0}", list.IndexOf(temp));
        } else {
            Console.WriteLine("false");
            Console.WriteLine("{0}", list.IndexOf(temp));
        }
    }
}