How to convert type 'byte[]' to 'System.Data.Linq.Binary'

How to convert type 'byte[]' to 'System.Data.Linq.Binary'

I have a WorkflowInstances table in my DB which contains this fields: ID
(int), Name (nvarchar(50), WorkflowID (int), Document (varbinary(MAX))). I
want to insert a new WorkflowInstance so I wrote this code
Stream myStream = openFileDialogDoc.OpenFile();
if (myStream != null)
{
using (myStream)
{
WorkflowInstance w = new WorkflowInstance();
byte[] bytes = new byte[myStream.Length];
myStream.Read(bytes, 0, (int)myStream.Length);
w.ID =
repository.WorkflowsRepository.GetMaxIDWokflowInstance()
+ 1;
w.Name = textBoxWorkflowInstanceName.Text;
w.CurrentStateID =
repository.WorkflowsRepository.GetWorkflowFirstState((int)listBoxMyWorkflows.SelectedValue);
w.WorkflowID = (int)listBoxMyWorkflows.SelectedValue;
w.CreationDate = System.DateTime.Now.ToString();
w.Document = bytes;
RapidWorkflowDataContext context = new
RapidWorkflowDataContext();
context.WorkflowInstances.InsertOnSubmit(w);
context.SubmitChanges();
}
}
I got an error in line 15, the error is: Cannot implicitly convert type
'byte[]' to 'System.Data.Linq.Binary'