private void btn_Order_Click(object sender, EventArgs e) { //set to default combo_Students.Text = "Choose student"; combo_Products.Text = "Choose product"; //get studentid string studentInput = combo_Students.SelectedItem.ToString(); string selectedStudent = studentInput.Substring(0, 2); selectedStudent = selectedStudent.Replace(" ", String.Empty); int selectedStudentID = int.Parse(selectedStudent); //get productid string productInput = combo_Products.SelectedItem.ToString(); string selectedProduct = productInput.Substring(0, 2); selectedProduct = selectedProduct.Replace(" ", String.Empty); int selectedProductID = int.Parse(selectedProduct); //send to db try { Order_DAO order_db = new Order_DAO(); order_db.Db_Send_Order(selectedProductID, selectedStudentID); MessageBox.Show("Successfully placed order.", "Information", MessageBoxButtons.OK, MessageBoxIcon.Information); } catch (Exception error) { MessageBox.Show(error.ToString(), "Error while placing order", MessageBoxButtons.OK, MessageBoxIcon.Error); } }