AreaFallowed.cs

public class AreaFallowed
    {
        public AreaFallowed(string gardenID, NodaTime.LocalDate date, int x, int y, int width, int length)
        {
            GardenId = gardenID;
            Date = date;
            X = x;
            Y = y;
            Width = width;
            Length = length;
        }

        public string GardenId { get; private set; }
        public NodaTime.LocalDate Date { get; private set; }
        public int X {get; private set;}
        public int Y {get; private set;}
        public int Width {get; private set;}
        public int Length { get; private set; }
    }

AreaHarvested.cs

public class AreaHarvested
    {
        public AreaHarvested(string gardenID, NodaTime.LocalDate date, int x, int y, int width, int length)
        {
            GardenId = gardenID;
            Date = date;
            X = x;
            Y = y;
            Width = width;
            Length = length;
        }

        public string GardenId { get; private set; }
        public NodaTime.LocalDate Date { get; private set; }
        public int X { get; private set; }
        public int Y { get; private set; }
        public int Width { get; private set; }
        public int Length { get; private set; }
    }

AreaSown.cs

public class AreaSown
    {
        public AreaSown(string gardenID, string seedID, NodaTime.LocalDate date, int x, int y, int width, int length)
        {
            GardenId = gardenID;
            SeedId = seedID;
            Date = date;
            X = x;
            Y = y;
            Width = width;
            Length = length;
        }

        public string GardenId { get; private set; }
        public string SeedId { get; private set; }
        public NodaTime.LocalDate Date { get; private set; }
        public int X { get; private set; }
        public int Y { get; private set; }
        public int Width { get; private set; }
        public int Length { get; private set; }
    }

BootstrapProjections.cs

public class Bootstrap
{
  Projection<GardenState> _gardenProjection;
  public void Bootstrap()
  {
    var pb = new ProjectionBuilder<GardenState>();
    pb = pb.When<GardenCreated>((s, e) => { return s.Apply(e); });
    pb = pb.When<AreaFallowed>((s, e) => { return s.Apply(e); });
    pb = pb.When<AreaSown>((s, e) => { return s.Apply(e); });
    pb = pb.When<AreaHarvested>((s, e) => { return s.Apply(e); });

    _gardenProjection = pb.Build();
    
    var eventHandler1 = new SomeEventHandler(_gardenProjection);
  }         
}

public class SomeEventHandler : IHandleMsg<GardenCreated>
{
  GardenState _currentState;
  Projection<GardenState> _projection
  public void SomeEventHandler(Projection<GardenState> projection)
  {
    _projection = projection;
    
    
  }
  public void Handle(GardenCreated @event)  
  {
    _currentState = _projection.Project(_currentState, @event);
  }
}

GardenCreated.cs

public class GardenCreated
    {
        public GardenCreated(string gardenID, string name, NodaTime.LocalDate date, int width, int length)
        {
            GardenId = gardenID;
            GardenName = name;
            Date = date;
            Width = width;
            Length = length;
        }
        public string GardenId { get; private set; }
        public string GardenName { get; private set; }
        public NodaTime.LocalDate Date { get; private set; }
        public int Width { get; private set; }
        public int Length { get; private set; }
    }

GardenState.cs

public class GardenState
    {
        public GardenState()
        {

        }
        public GardenState(NodaTime.LocalDate createdOn, string name, int width, int length)
        {
            GardenCreated = createdOn;
            GardenName = name;
            GardenWidth = width;
            GardenLength = length;
        }

        public NodaTime.LocalDate GardenCreated { get; private set; }
        public string GardenName { get; private set; }
        public int GardenWidth { get; private set; }
        public int GardenLength { get; private set; }



        public GardenState Apply(GardenCreated @event)
        {
            return new GardenState()
            {
                GardenCreated = @event.Date,
                GardenName = @event.GardenName,
                GardenWidth = @event.Width,
                GardenLength = @event.Length
            };
        }

        public GardenState Apply(AreaFallowed @event)
        {
            //TODO: change the state based on evt
            return new GardenState();
        }

        public GardenState Apply(AreaSown @event)
        {
            //TODO: change the state based on evt
            return new GardenState();
        }

        public GardenState Apply(AreaHarvested @event)
        {
            //TODO: change the state based on evt
            return new GardenState();
        }
    }