private void BtnKaydet_Click(object sender, EventArgs e) { var dto = new CarDTO() { Id = Guid.NewGuid(), Plate = txtPlate.Text, CarClassEnum = (CarClassEnum)cmbCarClass.SelectedItem, EngineCapacity = txtSilindirHac.Text, CylindeerVolume = txtSilindirHac.Text, DailyPrice = txtDailyPrice.Text, DriverLicenceType = (DriverLicenceTypeEnum)cmbLicenceType.SelectedItem, InsuranceExpiryDate = dtpsigorta.Value, InspectionExpiryDate = dtpkasko.Value, CarColorEnum = (CarColorEnum)cmbColor.SelectedItem, DateOfPurchase = dtpSatinAlmaTar.Value, FuelType = (FuelTypeEnum)cmbFuelType.SelectedItem, IsRented = false, ModelId = (Guid)cmbModel.SelectedValue }; var result = _cc.CarAdd(dto); result.NotificationShow(); if (result.State == ResultState.Success) { txtPlate.Text = ""; dtpkasko.Value = DateTime.Today; dtpSatinAlmaTar.Value = DateTime.Today; dtpsigorta.Value = DateTime.Today; } }