Gets and sets the property DefaultRootObject. The object that you want CloudFront
            to return (for example, index.html)    when an end user requests the root URL for
            your distribution    (http://www.example.com) instead of an object in your distribution
               (http://www.example.com/index.html). Specifying a default root    object avoids
            exposing the contents of your distribution.    If you don't want to specify a default
            root object when you create a    distribution, include an empty DefaultRootObject
            element.    To delete the default root object from an existing distribution, update
            the    distribution configuration and include an empty DefaultRootObject    element.
            To replace the default root object, update the distribution configuration    and specify
            the new object.
            
 Declaration Syntax
 Declaration Syntax| C# | 
public string DefaultRootObject { get; set; }