in my ASP.NET app, I have a problem where if a user clicks on an email to a link to my page, along with it are some querystring values.

the querystring values are incorrect, these values are replaced:

=
&

which makes the querystring invalid.

how can I replace these values that have been changed to the original value? the = and & does not appear in the querystring but are replaced with things like %3d and %26