Error in Entity Framework code first.

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ASP.NET4

i am getting error like this.
The type initializer for 'System.Data.Entity.Internal.AppConfig' threw an exception.

here is my code

namespace EFfistSample
{
    class Program
    {
        static void Main(string[] args)
        {
            var person = new Person { FirstName = "Sreekanth", LastName = "Vankamamidi", BirthDate = DateTime.Now };
            using (var context = new MyContext())
            {
                context.Persons.Add(person);
                context.SaveChanges();
            }
            Console.Write("Person Saved");
            Console.ReadLine();
        }
    }
}

person.cs

namespace EFfistSample
{
  public class Person
    {
      public int PersonID { get; set; }
      public string LastName { get; set; }
      public string FirstName { get; set; }
      public DateTime BirthDate { get; set; }

  }
}

mycontext.cs

namespace EFfistSample
{
   public class MyContext : DbContext
    {
       public MyContext()
       { }

       public DbSet<Person> Persons { get; set; }
    }
}

app.config i have given like this.

<configuration>
  <appSettings>

  </appSettings>
  <connectionStrings>
    <add name="MyContext" connectionString="Data Source=(local); Initial Catalog=mydb; Integrated Security=True;" providerName="System.Data.SqlClient"/>
  </connectionStrings>
  <configSections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=4.4.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
  </configSections>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
  </entityFramework>

</configuration>

please help me

thank you.