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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