jQuery Forum

Here's my full solution below in case someone is out there doing the exact same thing. Note because my website is using aliasing, i had to read Request.RawUrl and parse it myself since the Request.QueryString object did not contain the values i passed.

    // reusable function that parses a string in standard query string format(foo=bar&dave=awesome) into a Dictionary collection of key/value pairs
    // return the reference to the object, you have to assign it to a local un-instantiated name
    // will accept a full url, or just a query string
    protected Dictionary<string, string> parseQueryString(string url)
    {
        Dictionary<string, string> d = new Dictionary<string, string>();

        if (!string.IsNullOrEmpty(url))
        {
            // if the string is still a full url vs just the query string
            if (url.Contains("?"))
            {
                string[] urlArray = url.Split('?');
                url = urlArray[1]; // snip the non query string business away
            }

            string[] paramArray = url.Split('&');

            foreach (string param in paramArray)
            {
                if (param.Contains("="))
                {
                    int index = param.IndexOf('=');
                    d.Add(param.Substring(0, index), param.Substring(++index));
                }
            }
        }
        return d;
    }

Then i just use my dictionary object to evaluate and rebuild my url with the opposite mobile value, dynamically setting the href on the toggle link. Some code is obviosuly left out, but for perspective, base._iPage.QueryStringParams hold my dictionary object that was returned, and base._iPage.IsMobile is just a bool property i also have via the page interface i use, that all my pages, and user controls, ect, can talk to.

        // get the left side fo the url, without querystrings
        StringBuilder url = new StringBuilder(Request.RawUrl.Split('?')[0]);

        // build link to self, preserving query strings, except flipping mobile value
        if (base._iPage.QueryStringParams.Count != 0)
        {
            if (base._iPage.QueryStringParams.ContainsKey("mobile"))
            {
                // set to opposite of current
                base._iPage.QueryStringParams["mobile"] = (!base._iPage.IsMobile).ToString();
            }

            int count = 0;
            url.Append('?');

            // loop through query string params, and add them back on
            foreach (KeyValuePair<string, string> item in base._iPage.QueryStringParams)
            {
                count++;
                url.Append(item.Key + "=" + item.Value + (count == base._iPage.QueryStringParams.Count ? "" : "&" )); 
            }
        }

        // assign rebuild url to href of toggle link
        viewMobileButton.HRef = url.ToString();
    }

Then on my pageinit this is where i actually check, first the quesry string, then the cookie, if neither of those are present, i run my mobile detection method, and set a cookie, and my interface bool property for easy access to conditionals that depends on it.

        QueryStringParams = base.parseQueryString(Request.RawUrl);

        if (QueryStringParams.ContainsKey("mobile") ? QueryStringParams["mobile"].ToLower().Equals("true") : false)
        {
            Cookies.bakeCookie("isMobile", "true"); // create a cookie
            IsMobile = true;
        }
        else if (QueryStringParams.ContainsKey("mobile") ? QueryStringParams["mobile"].ToLower().Equals("false") : false)
        {
            Cookies.bakeCookie("isMobile", "false"); // create a cookie
            IsMobile = false;
        }
        else
        {
            IsMobile = base.mobileDetection();
        }

        if (IsMobile)
            this.Page.MasterPageFile = "m-" + this.Page.MasterPageFile;
    }