How do I show the value in a label of one form in a label of another form?

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SQL

C#3.5

i want to show the total amnt ,which is in one form(billing form) ,in another form(payment form) which is opened as an object.

What I have tried:

i tried using getter and setter method where i stored the value of the total label in a variable in the getter setter class and tried to display it thru anotherr label in the required form(payment form) after converting to string data type. but after running the program it doesnt show the value as required . just "0".

(Billing form)

BillingSystemgettersetter bsgs = new BillingSystemgettersetter();
           bsgs.total = tot;

(Getter setter class)

public double total { get; set; }

(Payment form)

lbltot.Text = Convert.ToString(bsgs.total);