How to find index in linq query

List ostring = new List();
ostring.Add(“Archana”);
ostring.Add(“P”);
ostring.Add(“Parmar”);
ostring.Add(“Check”);
ostring.Add(“index”);

        IEnumerable<int> indexes = (from item1 in ostring
                                    where item1== "Check"
                                    select ostring.IndexOf(item1));
        Console.WriteLine(indexes.FirstOrDefault());

//Hope you are looking for this //