Gets and sets the property SnapshotIdentifier. 
            
A unique identifier for the snapshot that you are requesting. This identifier must be unique for all snapshots within the AWS account.
Constraints:
- Cannot be null, empty, or blank
- Must contain from 1 to 255 alphanumeric characters or hyphens
- First character must be a letter
- Cannot end with a hyphen or contain two consecutive hyphens
            Example:  CopyC#
CopyC#my-snapshot-id
 Declaration Syntax
 Declaration Syntax| C# | 
public string SnapshotIdentifier { get; set; }