public void DeleteComand() { var leaseTime = (from item in CarsCollection select item.LeaseTime); foreach (var time in leaseTime) { LeaseTime = time; } var phoneNumber = (from item in CarsCollection select item.PhoneNumber); foreach (var number in phoneNumber) { PhoneNumber = number; } var spaceType = (from item in CarsCollection select item.SpaceType); foreach (var space in spaceType) { SpaceType = space; } PayAmountSum = payAmountSum_func(); SqlConnectionCarsHistory history = new SqlConnectionCarsHistory(); history.InsertUserCarRecords(CarNumber, CarRegion, CarSeries, LeaseTime, PhoneNumber, SpaceType, TimeOut, PayAmountSum); SqlConnectionCar spam = new SqlConnectionCar(); spam.DeleteCar(CarNumber, CarRegion, CarSeries); CarsCollection = AllItems(); CarNumber = String.Empty; CarRegion = 0; CarSeries = String.Empty; PayAmountSum = String.Empty; TimeOn = TimeSpan.Zero; }