If AllowsVpcAndNonVpcInstanceMemberships is 'false', this field is blank. If AllowsVpcAndNonVpcInstanceMemberships is 'true' and this field
            is blank, then this option group can be applied to both VPC and non-VPC instances. If this field contains a value, then this option group
            can only be applied to instances that are in the VPC indicated by this field.
             
            
 Declaration Syntax
 Declaration Syntax| C# | 
public string VpcId { get; set; }