Override request.form value

I have this site with a lot of form pages in it.
Now I would like to clean the request.form values in order to avoid malicious code injections.

Since I don't want to go page by page and repeat writing the code to clean the values, I would like to do something generic for the site. So I have this module which is included in all my pages,
and there I want to go over the request.form values and clean them from illegal characters.

So the code looks like:

for each x in Request.Form
	Request.Form(x)=replace(Request.Form(x),">"," ")
next

Code (markup):

which means that I want to replace the ">" character with " " (empty string).

The thing is that I cannot override the request.form value.
I'm getting this error:

Microsoft VBScript runtime error '800a01b6'
Object doesn't support this property or method: 'Request'

Does ASP prevents this override?

I know that with PHP you can override the $_POST values.

Can someone here suggest how to workaround it?

TX,
loolweb guy.

 

U need to assign value.
Do like this.

I hope that may help u.