private void btnSave_Click(object sender, EventArgs e) { Customer customer = new Customer { Name = txtName.Text, Surname = txtSurname.Text, Gender = cmbGender.Text, Phone = mskPhone.Text, Email = txtEmail.Text, IdentityNumber = Convert.ToInt64(txtIdentityNumber.Text), RoomNumber = Convert.ToInt32(txtRoomNumber.Text), Pay = Convert.ToDecimal(txtPay.Text), EntryDate = Convert.ToDateTime(dtpEntryDate.Value), ReleaseDate = Convert.ToDateTime(dtpReleaseDate.Value) }; if (bo.Insert(customer)) { MessageBox.Show("Müşteri eklendi"); } }