private void mnuTopUp_Click(object sender, EventArgs e)
        {
            frmTopUp nextForm = new frmTopUp(this);

            nextForm.Show();
        }
        private void btnSignUp_Click_1(object sender, EventArgs e)
        {
            //Validation

            if (!txtFName.Text.Equals("") && !txtSName.Text.Equals("") && !txtEmail.Text.Equals("") && !txtPassword.Text.Equals("") && !txtContactNo.Text.Equals(""))
            {
                //customer email must not already exist
                //Error Message "Account already exists"

                Customer newCust = new Customer();
                newCust.setID(Convert.ToInt32(txtCustID.Text));
                newCust.setEmail(txtEmail.Text);

                if (!newCust.isCustomerRegistered())
                {
                    newCust.setForename(txtFName.Text);
                    newCust.setSurname(txtSName.Text);
                    newCust.setPassword(txtPassword.Text);

                    string contact = txtContactNo.Text;

                    if (contact.Substring(0, 2) == "08" || contact.Substring(0, 3) == "066")
                    {
                        newCust.setContactNo(txtContactNo.Text);

                        newCust.addCustomer();


                        //Display Confirmation Message
                        MessageBox.Show("Customer Registered - You may now book events on the system", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information);

                        //Ask user to top up
                        DialogResult confirmation = MessageBox.Show("Would you like to top up your account?", "TopUp", MessageBoxButtons.YesNo, MessageBoxIcon.Information);

                        if (confirmation == DialogResult.Yes)
                        {
                            this.Hide();
                            frmTopUp next = new frmTopUp(this);
                            next.Show();

                            //Load Top Up form
                            //frmTopUp nextForm = new frmTopUp(this);
                            //nextForm.Show();
                        }

                        //if no
                        //Reset UI
                        txtFName.Clear();
                        txtSName.Clear();
                        txtEmail.Clear();
                        txtPassword.Clear();
                        txtContactNo.Clear();
                        txtFName.Focus();
                        //Assign next Cust ID
                        txtCustID.Text = Convert.ToString(Customer.getNextID());
                    }
                    else
                    {
                        MessageBox.Show("Contact number must start with '08' or '066'", "Invalid Number Format", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    }
                }
                else
                {
                    //Display Confirmation Message
                    MessageBox.Show("Email Address is already registered to another account, please use a differnet email or contact support to retrieve password.", "Account already registered", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    txtEmail.Clear();
                    txtEmail.Focus();
                }
            }
            else
            {
                MessageBox.Show("Information Missing", "Error!", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }
        }