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

SolrNet has some very helpful Url extension methods. http://code.google.com/p/solrnet/source/browse/trunk/SampleSolrApp/Helpers/UrlHelperExtensions.cs?r=512

    /// 

    /// Sets/changes an url's query string parameter.
    /// 
    /// 
    /// URL to process
    /// Query string parameter key to set/change
    /// Query string parameter value
    /// Resulting URL
    public static string SetParameter(this UrlHelper helper, string url, string key, string value) {
        return helper.SetParameters(url, new Dictionary {
            {key, value}
        });
    }