Filter Files of Type in HtmlInputFile

Is anyone know how to filtering the file type in web using C#? Let say if user select microsoft excel in a dropdownlist, when he clicked on the browse button, the files of type will automatically filter to files in *.xls. As I know the OpenFileDialog can use filter method, but this is only limited to window form. Pls advise on the filtering issue. TQ.
cheongkaboAsked:
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testnCommented:
although it's the html standard, no one implements it yet.
http://www.cs.tut.fi/~jkorpela/forms/file.html#filter

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cheongkaboAuthor Commented:
dear testn

The article you suggested is going to check the file type when send/submit button was clicked but the Files of Type in the dialog box is still showing *.*/All Files. My requirement is how to make the Files of Type in the dialog box to be filtered as *.xls   or *.doc or... instead of showing *.*. Would it possible to make it in the web using C#?? TQ.
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