private void button2_Click(object sender, EventArgs e) //insert c { CUSTOMER addc = new CUSTOMER(); addc.CUSTOMERID = Convert.ToInt16(context.CUSTOMERs.ToList().Last().CUSTOMERID + 1); addc.NAME = textcname.Text; addc.ADRESA = textcadresa.Text; context.AddToCUSTOMERs(addc); int rowsAffected = context.SaveChanges(false); textCh.Text = rowsAffected.ToString() + " changes made to the customers (insert)"; }