The DB instance identifier. This parameter is stored as a lowercase string. Constraints: 
- Must contain from 1 to 63 alphanumeric characters or hyphens (1 to 15 for SQL Server).
- First character must be a letter.
- Cannot end with a hyphen or contain two consecutive hyphens.
 Declaration Syntax
 Declaration Syntax| C# | 
public string DBInstanceIdentifier { get; set; }