How to update querystring in C#?

Question

Somewhere in the url there is a &sortBy=6 . How do I update this to &sortBy=4 or &sortBy=2 on a button click? Do I need to write custom string functions to creat

Answer 1

I think you could perform a replacement of the query string in the following fashion on your server side code.

NameValueCollection filtered = new NameValueCollection(request.QueryString);

filtered.Remove("SortBy");
filtered.Add("SortBy","4");