Removing some querystring values from collection

Below code is used for removing the query string parameters from the collection of parameters-

Dim isreadonly As PropertyInfo = GetType(System.Collections.Specialized.NameValueCollection).GetProperty("IsReadOnly", BindingFlags.Instance Or BindingFlags.NonPublic)

' make collection editable
isreadonly.SetValue(HttpContext.Current.Request.QueryString, False, Nothing)

' remove
HttpContext.Current.Request.QueryString.Remove("uid")
HttpContext.Current.Request.QueryString.Remove("pwd")

HttpContext.Current.Response.Redirect(HttpContext.Current.Request.Url.AbsolutePath + "?" & Convert.ToString(HttpContext.Current.Request.QueryString))Rem