get bytes array from database bind to fileupload

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C#

ASP.NET

Iam converting fileupload image as bytes and saved to oracledatabase as Blob datatype

I used Following code

Byte[] imgByte = null;
HttpPostedFile File;

File = FileUpload_choice1.PostedFile;
                imgByte = new Byte[File.ContentLength];
                File.InputStream.Read(imgByte, 0, File.ContentLength);
                QB.QUESTION_CHOICE1_IMG = imgByte;

It successfully saved into blob

But now i retrieve blob data and bind to fileupload
how can i convert blob to bytes array
How can i show bytes array to fileupload

Any suggestions