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?

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.