REPLACE QUERY PARAMETER VALUE

1. Response.Redirect(ReplaceQueryParameterValue(Request.RawUrl, "all", "1"));
3. private string ReplaceQueryStringValue(string url, string key, string value)
4. {
5. return url.Contains(key) ? Regex.Replace(url, @"([?&]" + key + ")=[^?&]+", "$1=" + value) : (url + (url.Contains("?") ? "&" : "?") + key + "=" + value);
6. }
9. private string ReplaceQueryParameterValue(string query, string name, string value)
10. {
11. string output;
13. if (query.Contains(name + "="))
14. {
15. output = System.Text.RegularExpressions.Regex.Replace(query,
16. @"(&|\?)" + name + @"=[0-9A-Za-z\+\!\*\(\)\'\-\$\,\.]+", @"$1" + name + "=" + value,
17. System.Text.RegularExpressions.RegexOptions.IgnoreCase);
18. }
19. else
20. output = query + (query.Contains("?") ? "&" : "?") + name + "=" + value;
22. return output;
23. }