ok.cs

public class Person 
{
  public string FirstName { get; set; }
  public string LastName { get; set; }
  public int Age { get;set; }
}


var people = new List<Person> {
  new Person { FirstName = "Bill", LastName = "Smith", Age = 60 },
  new Person { FirstName = "Jane", LastName = "Doe", Age = 41 },
  new Person { FirstName = "Joe", LastName = "Schmoe", Age = 24 }
}

foreach (var p in people.Where (p => p.Age >= 6)) 
  Console.WriteLine ("{0} is old.", p.FirstName);
  
var notJane = from p in people where FirstName != "Jane" select p;