using System.Reflection; string sCurrentValue = Request.QueryString[“QueryParam”];            PropertyInfo isreadonly = typeof(System.Collections.Specialized.NameValueCollection).GetProperty(“IsReadOnly”, BindingFlags.Instance | BindingFlags.NonPublic);            // make collection editable            if (HttpContext.Current.Request != null)            {                // remove                isreadonly.SetValue(HttpContext.Current.Request.QueryString, false, null);                HttpContext.Current.Request.QueryString.Remove(“QueryParam=” + sCurrentValue);                HttpContext.Current.Request.QueryString.Set(“QueryParam”, newValue);                isreadonly.SetValue(HttpContext.Current.Request.QueryString, true, null);            }   here ”  isreadonly.SetValue(HttpContext.Current.Request.QueryString, false, null); “ Second Parameter false set the readonly property to false. Now you can…

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