Thanks for the answer!
let me expose my problem maybe you will be able to help me out:
I have a form like this:
For each question of the form, In the function OnChange you can see that I set my 2 variables: VarNonQuestionNumber (and I but this variable in the Default property) and VarNum for the number of the question.

And when people clic "Non" in the drop down; the function OnChange gets me in another page:

When people clic on the "X" Icon to quit this page, I want the dropdown to take the Empty value (""). Thats why I have to set a different variable name each time..
That's why I am creating a new variable for each question; so that if they clic the "X" to exit the page, it only updates the value of the last question..
I hope I was clear, and if you have any idea to do it an other way I would appreciate!
Thanks for your time