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

i have workflowinstances table in db contains fields: id (int), name (nvarchar(50), workflowid (int), document (varbinary(max))). want insert new workflowinstance wrote 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 error in line 15, error is: cannot implicitly convert type 'byte[]' 'system.data.linq.binary'

system.data.linq.binary has constructor taking 1 argument of byte[]:

w.document = new system.data.linq.binary(bytes);