Sample 1 - before

Projection.cs

public class CurrentPortfolioProjection : 
  IHandle<AddedRealtyToPortfolio>, 
  IHandle<RemovedRealtyFromPortfolio> {

  Func<PortfolioContext> _contextFactory;

  public CurrentPortfolioProjection(Func<PortfolioContext> contextFactory) {
    _contextFactory = contextFactory;
  }

  public void Handle(AddedRealtyToPortfolio @event) {
    using(var context = _contextFactory()) {
      context.CurrentPortfolioEntry.Add(
        new CurrentPortfolioEntry(
          @event.PortfolioId, @event.RealtyId, 
          @event.RealtySummary, @event.RealtySlideshowUrl, 
          @event.RealtyPropertySheetUrl, @event.RealtyFloorPlanUrl));
      context.SaveChanges();
    }
  }

  public void Handle(RemovedRealtyFromPortfolio @event) {
    using(var context = _contextFactory()) {
      var currentPortfolioEntry = 
        context.CurrentPortfolioEntry.Single(
          entry => 
            entry.PortfolioId == @event.PortfolioId && 
            entry.RealtyId == @event.RealtyId);

      context.CurrentPortfolioEntry.Remove(currentPortfolioEntry);
      context.SaveChanges();
    }
  }
}