my qcm project

[C# Programming]

in the first form i have a table of labels of categories(history, geography, etc...)and a label that counts the money that i have (we start by a certain number of money) so when i click on a label a question must appear in a new form, i answer the question and i claculate the new amout of money, i close the new form and return to the initial form where the label that counts the money must be uptadeted... the problem is when i come back to the initial form the label shows the initial amout that i have initially entered without being uptated.. even though i declared a public class