How to access a textbox from another form and show the value ? C#

Question

I am making an ordering system and I want the orders of the customer to be display in the text box of an another form. Please help! Thank you..... btw it's a school project :(

This is the code of where I want to access the textbox:

if (cbo1.Checked != cbo2.Checked != cbo3.Checked)
{

    QuantityMSG qmsg = new QuantityMSG();
    qmsg.Show();

    int r = 0;
    quant(r, 45, "Buko Pandan                                                                                      P ");
    txtTotal.Text(" " + tot);
    //area1.append(" " + dish);

    cbo1.Checked = false;

}

The class of it is:

public partial class Menu : Form
{
    public Menu()
    {
        InitializeComponent();

    }

This is where the text box form:

public partial class Payment : Form
{
    public Payment()
    {
        InitializeComponent();
    }

Answer 1

First add a property to your Payment form:

 public string TextBoxValue
    {
        get { return txtTotal.Text;} 
        set { txtTotal.Text = value;}
    }  

And in the caller form (perhaps Menu) access it like this:

Payment payment = new Payment();
payment.TextBoxValue = "The value you want";