elementary LINQ and Lambdas stuff

• Get the earliest date from a series of child objects:
  

  var foo = (from bar in this.CollectionOfChildren select bar.BirthDate).Min();

  
   
• Get the last date:
  

  var foo = (from bar in this.CollectionOfChildren select bar.BirthDate).Max();

  
   
• A simple Lambda:
  

  var foo = this.CollectionOfChildren.Where(bar => bar.IsOk == true);

  
   
• In this example, index is the place in the array or list:
  

  var baz = this.CollectionOfChildren.Where((qux, index) => qux.Age < index);

  
   
• Remove duplicates:
  

  List<T> cleanList = listWithSomeDuplicates.Distinct().ToList();