Gets and sets the property DefaultOs. 
            
            The stack's default operating system, which must be set to  CopyC#
            or
CopyC#
            or Amazon Linux
 CopyC#.         The default option is
CopyC#.         The default option is Ubuntu 12.04 LTS CopyC#.
CopyC#.
             
            Amazon Linux
 Declaration Syntax
 Declaration Syntax| C# | 
public string DefaultOs { get; set; }