The new DB instance identifier for the DB instance when renaming a DB Instance. This value is stored as a lowercase string. Constraints:
            
- Must contain from 1 to 63 alphanumeric characters or hyphens
- First character must be a letter
- Cannot end with a hyphen or contain two consecutive hyphens
 Declaration Syntax
 Declaration Syntax| C# | 
public string NewDBInstanceIdentifier { get; set; }