private void btnRegister_Click(object sender, EventArgs e)
        {
            string productID = Convert.ToString(cBoxProduct.SelectedValue);



            int customerID = Convert.ToInt32(cBoxCustName.SelectedValue);


            try
            {
                RegistrationDB regDB = new RegistrationDB();



                if (regDB.ProductRegistration(customerID, productID))
                {
                    MessageBox.Show("Registration Exists", "Registration", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }

                else
                {
                    Registration aRegistration = new Registration();

                    DateTime myDateTime       = DateTime.Now;
                    string   sqlFormattedDate = myDateTime.ToString("yyyy-MM-dd HH:mm:ss.fff");

                    aRegistration.RegistrationDate = myDateTime;

                    regDB.AddRegistration(aRegistration);


                    MessageBox.Show("Registrationd Added", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }