how to insert image in sql server 2008 in .net?

Question

how to insert image in sql server 2008 in .net?

i am using below code

string str;

FileUpload img = (FileUpload)imgUpload;

            Byte[] imgByte = null;

            if (img.HasFile && img.PostedFile != null)

            {

                HttpPostedFile File = imgUpload.PostedFile;

                imgByte = new Byte[File.ContentLength];

                File.InputStream.Read(imgByte, 0, File.ContentLength);

        

    }

str ="Insert into tblimg values ('"+imgByte.tostring()+"')";

it's not working