function  CallBackHandler(result, context){
    if (context.CommandName == "LeggiProgetti"){
        document.forms[0].elements['DropDownList3'].options.length = 0;
        while (result.length > 0) {
            var indexofSep = result.indexOf(";");
            var indexofID = result.indexOf("_");
            var itemID= result.substring(0,indexofID); 
            var itemList = result.substring(indexofID+1, indexofSep);
            result = result.substring(indexofSep + 1);
            document.forms[0].elements['DropDownList3'].options.add(new Option( itemList , itemList ));
        }
        
        
    }
}