Missing function in WinCE ASP server

I'm trying to go through an Html form to create a XML file. I'm trying to use this instruction to go through a HTML form until it finds a开发者_运维百科 Button.

If instr(1,Request.Form.Key(x),"button") = 0 Then

But Request.Form.Key(x) isn't supported in WindowsCE ASP. Does anyone knows of any suitable replacement for this function?

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In WinCE there is no way to access the set of available keys in the collection. The best you can do is have fore-knowledge of the likely and possible key names and try each in turn. Yuck!

It would better if you removed the need for this approach altogether.