Combination of Radiobutton and Dropdownlist

there is a radio button, a dropdownlist. radiobuttons are A,B,C ( in my database there are fields named A,B,C) if i select A in my radio button the data should be displayed from field A and if i select B in my radio button the data should be displayed from B field is it possible.
MY ASP.NET WEB IS HAVING VB CODE BEHIND
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