Создание слоя с моделями.

TransportCompany/TransportCompanyDataModels/IId.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace TransportCompanyDataModels
+{
+	public interface IId
+	{
+		int Id { get; }
+	}
+}

TransportCompany/TransportCompanyDataModels/Models/ICargo.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace TransportCompanyDataModels.Models
+{
+	public interface ICargo : IId
+	{
+		//тип груза
+		string TypeCargo { get; }
+	}
+}

TransportCompany/TransportCompanyDataModels/Models/IClient.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace TransportCompanyDataModels.Models
+{
+	public interface IClient : IId
+	{
+		string Name { get; }
+
+		string Surname { get; }
+
+		//отчество
+		string Patronymic { get; }
+
+		string TelephoneNumber { get; }
+
+		string Email { get; }
+	}
+}

TransportCompany/TransportCompanyDataModels/Models/ITransportModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace TransportCompanyDataModels.Models
+{
+	public interface ITransportModel : IId
+	{
+		//тип транспорта для перевозки
+		string Tranport { get; }
+	}
+}

TransportCompany/TransportCompanyDataModels/Models/ITransportationType.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace TransportCompanyDataModels.Models
+{
+	public interface ITransportationType : IId
+	{
+		//тип транспортировки
+		string TransportationType { get; } 
+	}
+}

TransportCompany/TransportCompanyDataModels/Models/ITrucking.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace TransportCompanyDataModels.Models
+{
+	public interface ITrucking : IId
+	{
+		int ClientId { get; }
+
+		int CargoId { get; }
+
+		double Price { get; }
+
+		DateTime DateStart { get; }
+
+		DateTime DateEnd { get; }
+
+		int TypeTransportationId { get; }
+
+		int TransportId { get; }
+	}
+}