Returns a Stream for writing to S3.  If the file already exists it will be overwritten.
            
 Declaration Syntax
 Declaration Syntax| C# | 
public Stream OpenWrite()
 Return Value
 Return ValueStream to write from.
 Exceptions
 Exceptions| Exception | Condition | 
|---|---|
| IOException | The file is already open. | 
| WebException | |
| AmazonS3Exception |