Beginner C#: Calculate order using combobox, checkbox and radiobutton

[Sosa Tabares]

I am trying to create a program where you can select 1 of 3 different options in each of the 3 combo boxes with how many of the item you want. Once you calculate, it will display the subtotal plus tax. The combobox showing the quantity should be in loop (1 to 3). How should I do that? If anyone can help it would be great.

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