identify the file type

i need to create web page  (in asp.net and c# 2.0) that lets the user upload files and sorts them into the following broad categories (a)audio (b)video (c)document (d)any other file.

i require implementation appraoch for the sorting logic. can anyone help? thanks
vkkconsulAsked:
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dinomixCommented:
Create an array with all the file types you support and concatenate a category to each one, example:
mp3a
wava
movb
qtvb
docc
xlsc
Then loop through and find a match based on extention and use the last character to map to a category.
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vkkconsulAuthor Commented:
i appreciate the suggestion to use file type method. i am wondering is there any inherent feature of .net that provides this kind of clasification (thru tags/attributes etc.).  
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dinomixCommented:
There is none i know of, file extentions indicate the file type, there is no categorization of extentions present inherently in windows or .net that i am aware of. This is a custom grouping and you would need to code the different groups.
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