public virtual void CreateCampaign(DateTime now, Demographic demographic, DateTime start, DateTime end)
{
if (LatestCampaign != null && LatestCampaign.GetStatus(now) != CampaignStatus.Ended)
{
throw new InvalidOperationException("You can't start a campaign until the existing one has ended.");
}
var campaign = new Campaign(demographic, start, end);
_campaigns.Add(campaign);
LatestCampaign = campaign;
}
public Campaign(Demographic demographic, DateTime startDate, DateTime endDate)
{
Demographic = demographic;
StartDate = startDate;
EndDate = endDate;
}