A string that represents the name of a domain. Domain names must be unique across the domains owned by an account within an AWS region.
            Domain names must start with a letter or number and can contain the following characters: a-z (lowercase), 0-9, and - (hyphen). Uppercase
            letters and underscores are not allowed.
             
            
Constraints:
 Declaration Syntax
 Declaration Syntax| C# | 
public string DomainName { get; set; }