>Hi All, is it possible in a "Linq type way" to set properties of class instances which are in a IList ? , for example I have a list of names and addresses in a list and if there are some that share a certain residential area code (e.g. UK ) I would like to set a property in the instances, hope this makes sense.

Closest you can get is probably something like:

foreach(Info i in list.Where(x=>x.Postcode.StartsWith="HR"))
            {
                i.SomeProperty = true;
            }