Sample 1 - after

Projection.cs

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

  IProjectionSqlOperations<CurrentPortfolioEntry> _operations;

  public CurrentPortfolioProjection(IProjectionSqlOperations<CurrentPortfolioEntry> operations) {
    _operations = operations;
  }

  public void Handle(AddedRealtyToPortfolio @event) {
    _operations.Insert(
      new CurrentPortfolioEntry(
        @event.PortfolioId, @event.RealtyId, 
        @event.RealtySummary, @event.RealtySlideshowUrl, 
        @event.RealtyPropertySheetUrl, @event.RealtyFloorPlanUrl));
  }

  public void Handle(RemovedRealtyFromPortfolio @event) {
    _operations.Delete(entry => 
      entry.PortfolioId == @event.PortfolioId && 
      entry.RealtyId == @event.RealtyId);
  }
}