private void button1_Click(object sender, EventArgs e) { int penNumber, penCap, petNumber, clinicNumber; string petComments; DateTime DateIN, DateOUT; penNumber = Convert.ToInt32(cmbPenNumber.SelectedValue.ToString()); penCap = 4; petNumber = Convert.ToInt32(txtPNum.Text); petComments = rtbComments.Text; DateIN = dateTimePicker1.Value; DateOUT = dateTimePicker2.Value; clinicNumber = Convert.ToInt32(cmbClinicNumber.SelectedValue.ToString()); database.BookPen(penNumber, penCap, penStatus, petNumber, petComments, DateIN, DateOUT, clinicNumber); this.Close(); }