ReflectionProblem.cs

namespace Sandbox2
{
    using System;
    using System.Linq;
    using System.Reflection;

    public static class Program
    {
        public static void Main()
        {
            var personGenerator = new PersonGenerator();
            IPerson student = personGenerator.Generate("Student");
            Console.WriteLine(student.Name);
        }
    }

    public class PersonGenerator
    {
        public IPerson Generate(string typeName)
        {
            var personType = Assembly
                .GetEntryAssembly()
                .GetTypes()
                .FirstOrDefault(
                    type =>
                        type.CustomAttributes.Any(a => a.AttributeType == typeof (PersonAttribute)) &&
                        type.Name == typeName);

            if (personType == null)
            {
                throw new ArgumentNullException();
            }

            var person = Activator.CreateInstance(personType) as IPerson;

            return person;
        }
    }

    [Person]
    public class Student : IPerson
    {
        public Student(string name = "Name")
        {
            this.Name = name;
        }

        public string Name { get; private set; }
    }

    public interface IPerson
    {
        string Name { get; }
    }

    [AttributeUsage(AttributeTargets.Class)]
    public class PersonAttribute : Attribute
    {
    }
}