Gets and sets the property DefaultSubnetId. 
            
            The stack's default subnet ID.         All instances will be launched into this subnet
            unless you specify otherwise when you create the instance.         If you also specify
            a value for  CopyC#, the subnet must be in the same zone.
                    For information on default values and when this parameter is required, see
            the
CopyC#, the subnet must be in the same zone.
                    For information on default values and when this parameter is required, see
            the DefaultAvailabilityZone
 CopyC# parameter description.
CopyC# parameter description.  
            VpcId
 Declaration Syntax
 Declaration Syntax| C# | 
public string DefaultSubnetId { get; set; }