how to pass a string from .aspx to a class

Hi,
I need to pass a string from my .aspx page to my .VB class.
i need to capture (device_category; accept_headers : user_agent) and pass the values to my class, i tryed to captur the values on the clas itself but i got an error(valuse are not member of this class..)
How can i have a string accessable to my class?


thanks

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