How can I remove item from querystring in asp.net using c#?

If it's the HttpRequest.QueryString then you can copy the collection into a writable collection and have your way with it.

NameValueCollection filtered = new NameValueCollection(request.QueryString);filtered.Remove("Language");

Here is a simple way. Reflector is not needed.

    public static string GetQueryStringWithOutParameter(string parameter)    {        var nameValueCollection = System.Web.HttpUtility.ParseQueryString(HttpContext.Current.Request.QueryString.ToString());        nameValueCollection.Remove(parameter);        string url = HttpContext.Current.Request.Path + "?" + nameValueCollection;        return url;    }

Here QueryString.ToString() is required because Request.QueryString collection is read only.

Finally,

hmemcpy answer was totally for me and thanks to other friends who answered.

I grab the HttpValueCollection using Reflector and wrote the following code

        var hebe = new HttpValueCollection();        hebe.Add(HttpUtility.ParseQueryString(Request.Url.Query));        if (!string.IsNullOrEmpty(hebe["Language"]))            hebe.Remove("Language");        Response.Redirect(Request.Url.AbsolutePath + "?" + hebe );