Please tell me how to store a user given input as one of the options in the combo box??

I have put up a combo box on my form with no collection,no options to choose from, in it.I want the user to enter some value in it and the next time he/she uses the form,the value he/she entered last plus the one he/she will enter now are stored as options in the combo box.I mean to say that i don't want to populate the combo box via a dataset..but by the user only..at runtime.
Your help will be valuable!Thank you in advance..

[ComboBoxName].Item.add(....)

[ComboBoxName].Item.add(....)

[ComboBoxName].Items.add("....")

Thanks :)

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