ASP.Net MVC 3 session management when using IOC pattern

What I would do is first create an Interface containing all the properties you would need to store in the Session (i.e.: the context):

using ProjectName.Core.Domain;

namespace ProjectName.Core.Interfaces
{
    public interface IProjectNameSessionContext
    {
        string StringProperty1 { get; set; }
        bool BoolProperty1 { get; set; }
        ProjectName.Core.Domain.Entity1 DomainEntity1 { get; set; }
    }
}

Then create a class that implements this interface, mark it as serializable:

using ProjectName.Core.Interfaces;

namespace ProjectName.Front.SessionData
{
    [Serializable]
    public class ProjectNameSessionContext : IProjectNameSessionContext
    {
        public string StringProperty1 { get; set; }
        public bool BoolProperty1 { get; set; }
        public ProjectName.Core.Domain.Entity1 DomainEntity1 { get; set; }
    }
}

And finally tell your IOC to bind the interface with the class at runtime an instantiate an object in HttpSession context.

It looks like this with StrucureMap:

For<Core.Interfaces.IProjectNameSessionContext>().LifecycleIs(new HttpSessionLifecycle()).Use<ProjectNameSessionContext>();

Hope that helps!