Исправил ошибки

Hotel/HotelBusinessLogic/BusinessLogic/ConferenceLogic.cs

@@ -126,6 +126,7 @@ namespace HotelBusinessLogic.BusinessLogic
 				Id = element.Id,
 				ConferenceName = element.ConferenceName,
 				Subject = element.Subject,
+                StartDate = element.StartDate,
                 OrganiserId = element.OrganiserId,
 				ConferenceParticipants = element.ConferenceParticipants,
 			});
@@ -144,7 +145,7 @@ namespace HotelBusinessLogic.BusinessLogic
 			if (string.IsNullOrEmpty(model.ConferenceName)) 
 				throw new ArgumentException("Нет названия конференции", nameof(model.ConferenceName));
 
-			_logger.LogInformation("Conference. ConferenceName:{ConferenceName}. Id: { Id}", model.ConferenceName, model.Id);
+			_logger.LogInformation("Conference. ConferenceName:{ConferenceName}.StartDate:{ StartDate}.Id: { Id}", model.ConferenceName, model.StartDate, model.Id);
 		}
 	}
 }

Hotel/HotelBusinessLogic/BusinessLogic/RoomLogic.cs

@@ -123,7 +123,7 @@ namespace HotelBusinessLogic.BusinessLogic
 				Id = element.Id,
 				RoomNumber = element.RoomNumber,
 				RoomPrice = element.RoomPrice,
-				CountBeds = element.CountBeds,
+                DateCreate = element.DateCreate,
 				MealPlanId = element.MealPlanId,
 				AdministratorId = element.AdministratorId,
 				RoomDinners = element.RoomDinners,
@@ -148,16 +148,12 @@ namespace HotelBusinessLogic.BusinessLogic
 			{
 				throw new ArgumentNullException("Номер комнаты не может быть меньше 0", nameof(model.RoomNumber));
 			}
-			if (model.CountBeds < 0)
-			{
-				throw new ArgumentNullException("Количество спальных мест не может быть меньше 0", nameof(model.CountBeds));
-			}
 			if (model.RoomPrice < 0)
 			{
 				throw new ArgumentNullException("Цена комнаты не может быть меньше 0", nameof(model.RoomPrice));
 			}
 
-			_logger.LogInformation("Room. RoomNumber:{RoomNumber}.CountBeds:{CountBeds}.RoomPrice:{RoomPrice}. Id: {Id}", model.RoomNumber, model.CountBeds, model.RoomPrice, model.Id);
+			_logger.LogInformation("Room. RoomNumber:{RoomNumber}.RoomPrice:{RoomPrice}. Id: {Id}", model.RoomNumber, model.RoomPrice, model.Id);
 		}
 	}
 }

Hotel/HotelContracts/BindingModels/ConferenceBindingModel.cs

@@ -15,6 +15,7 @@ namespace HotelContracts.BindingModels
 
 		public string Subject { get; set; } = string.Empty;
 
+        public DateTime StartDate { get; set; } = DateTime.Now;
         public int OrganiserId { get; set; }
 
 		public Dictionary<int, IParticipantModel> ConferenceParticipants { get; set; } = new();

Hotel/HotelContracts/BindingModels/RoomBindingModel.cs

@@ -11,7 +11,7 @@ namespace HotelContracts.BindingModels
 	{
 		public int Id { get; set; }
 		public int RoomNumber { get; set; }
-		public int CountBeds { get; set; }
+        public DateTime? DateCreate { get; set; }
         public double RoomPrice { get; set; }
 		public int AdministratorId { get; set; }
 		public int? MealPlanId { get; set; }

Hotel/HotelContracts/SearchModels/ConferenceBookingSearchModel.cs

@@ -13,7 +13,5 @@ namespace HotelContracts.SearchModels
 		public int? ConferenceId { get; set; }
 		public string? PlaceСonference { get; set; }
 		public DateTime? DateСonference { get; set; }
-		public DateTime? DateFrom { get; set; }
-		public DateTime? DateTo { get; set; }
 	}
 }

Hotel/HotelContracts/SearchModels/ConferenceSearchModel.cs

@@ -11,7 +11,8 @@ namespace HotelContracts.SearchModels
 		public int? Id { get; set; }
 
 		public string? ConferenceName { get; set; }
-
         public int? OrganiserId { get; set; }
+        public DateTime? DateFrom { get; set; }
+        public DateTime? DateTo { get; set; }
     }
 }

Hotel/HotelContracts/SearchModels/RoomSearchModel.cs

@@ -11,5 +11,8 @@ namespace HotelContracts.SearchModels
 		public int? Id { get; set; }
 		public int? RoomNumber { get; set; }
 		public int? AdministratorId { get; set; }
+        public DateTime? DateCreate { get; set; }
+        public DateTime? DateFrom { get; set; }
+        public DateTime? DateTo { get; set; }
     }
 }

Hotel/HotelContracts/ViewModels/ConferenceViewModel.cs

@@ -19,6 +19,9 @@ namespace HotelContracts.ViewModels
 		public string Subject { get; set; } = string.Empty;
 
 		public int OrganiserId { get; set; }
+        [DisplayName("Дата начала конференции")]
+        public DateTime StartDate { get; set; }
+
 
         public Dictionary<int, IParticipantModel> ConferenceParticipants { get; set; } = new();
 		//public Dictionary<int, IConferenceBookingModel> ConferenceConferenceBooking { get; set; } = new();

Hotel/HotelContracts/ViewModels/RoomViewModel.cs

@@ -13,8 +13,8 @@ namespace HotelContracts.ViewModels
 		public int Id { get; set; }
 		[DisplayName("Номер комнаты")]
 		public int RoomNumber { get; set; }
-		[DisplayName("Количество спальных мест")]
+		[DisplayName("Дата создания номера")]
-		public int CountBeds { get; set; }
+        public DateTime? DateCreate { get; set; }
         [DisplayName("Стоимость номера")]
 		public double RoomPrice { get; set; }
 		public int AdministratorId { get; set; }

Hotel/HotelDataModels/Models/IConferenceModel.cs

@@ -4,6 +4,7 @@
 	{
 		string ConferenceName { get; }
 		string Subject { get; }
+        DateTime StartDate { get; }
         int OrganiserId { get; }
 		public Dictionary<int, IParticipantModel> ConferenceParticipants { get; }
 	}

Hotel/HotelDataModels/Models/IRoomModel.cs

@@ -9,8 +9,8 @@ namespace HotelDataModels.Models
 	public interface IRoomModel : IId
 	{
 		int RoomNumber { get; }
-		int CountBeds { get; }
 		double RoomPrice { get; }
+        DateTime? DateCreate { get; }
         int AdministratorId { get; }
 		public Dictionary<int, IDinnerModel> RoomDinners { get; }
 	}