How to remove partucular list of querystring from current page url querystring in c#2.0

string excludeQuerystring = DynConfig.Item("GoogleSEOLinkSettings/ExcludeQuerystring"); //this is the list of my exclude querystring (cid,intcid,del)

querystring = HttpContext.Current.Request.Url.AbsoluteUri.Split('?')[1]; //I will get faqid=12123&cid=4545,intcid=65456

StringBuilder fullQueryString = new StringBuilder();

if (!string.IsNullOrEmpty(excludeQuerystring) && !string.IsNullOrEmpty(querystring))
{
	string[] strEQ = excludeQuerystring.Split(',');  //making a array of excluded querystrings

	NameValueCollection navValues = HttpUtility.ParseQueryString(querystring);  //getting the list of querystring in NameValueCollection

	if (navValues.Count > 0)
	{
		string[] strQ = navValues.AllKeys;
		if(strQ.Length>0)
		{
			
		}
	}
}	

querystring= ?+faqid=12123&h=man //here I want updated querystring which does not have any querystring which is there in my excludeQuerystring

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 protected void Page_Load(object sender, EventArgs e)
        {
            string querystring = string.Empty;

            string excludeList = "cid,intcid,del";

            if (!string.IsNullOrEmpty(excludeList))
            {
                string getFinalString = GetQueryString(excludeList);
                getFinalString = "?" + getFinalString;
            }
        }

        public string GetQueryString(string excludeArray)
        {
            string retQueryString = string.Empty;
            if (excludeArray.IndexOf(",") != -1)
            {
                string[] strArray = excludeArray.Split(",".ToCharArray());
                NameValueCollection filtered = new NameValueCollection();

                filtered.Add(HttpUtility.ParseQueryString(Request.Url.Query));
                if (filtered.HasKeys())
                {
                    foreach (string strMatch in strArray)
                    {
                        filtered.Remove(strMatch);
                    }
                    retQueryString = filtered.ToString();
                }
            }

            return retQueryString;
        }

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retQueryString = filtered.ToString();

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