example.cs

namespace Land.Core.Commands
{
  public interface ICommand { }

  public class AddContractCommand : ICommand
  {
    public Guid Id { get; set; }
    public string Name { get; set; }
    public string ContractTerms { get; set; }
  }
  
}

namespace Land.Business.Contracts
{
  public interface IHandle<TCommand> where TCommand : ICommand
  {
    void Execute(TCommand command);
  }
  
  public class AddContractHandler : IHandle<AddContractCommand>
  {
    public void Execute(AddContractCommand command)
    {
      throw new NotImplementedException();
    }
  }
}

namespace Land.UI.Controllers
{
  public class ContractController : Controller
  {
    [HttpPost, ModelStateToTempData]
    public RedirectToRouteResult Add(AddContractCommand command)
    {
      if (!ModelState.IsValid)
        return this.RedirectToRoute(c => c.Add());
      _container.Get<IHandle<AddContractCommand>>().Execute(command);
      return this.RedirectToRoute(c => c.Index(command.Id));
    }
  }
}