Retrieve BLOB From SQL Server

I have a table in a SQL Server database that contains a field(data type image) that contains a text file.  I'm trying to retrieve this file and save it onto the hard drive.  I'm using the code below, but get I get the error 'Arguments are of the wrong type, are out of acceptable range, or are in conflict with one another.' at line 11.  This code worked fine when I tested it on the pubs database and exporting the logo field out of pub_info.  I'm not quite sure why this doesn't work for my database.  Can anyone see where I'm going wrong?

1         Dim cn As ADODB.Connection
2         Dim rs As ADODB.Recordset
3         Dim mstream As ADODB.Stream

4         cn = New ADODB.Connection
5         cn.Open("Provider=SQLOLEDB;data Source=server;Initial Catalog=database;User Id='userid';Password='password'")

6         rs = New ADODB.Recordset
7         rs.Open("Select * from filesubmissions where bundleId = 'F0000014.bun'", cn, ADODB.CursorTypeEnum.adOpenKeyset, ADODB.LockTypeEnum.adLockOptimistic)

8         mstream = New ADODB.Stream
9         mstream.Type = ADODB.StreamTypeEnum.adTypeBinary
10        mstream.Open()
11        mstream.Write(rs.Fields("BLOB").Value)
12        mstream.SaveToFile("c:export.txt", ADODB.SaveOptionsEnum.adSaveCreateOverWrite)

13        rs.Close()
14        cn.Close()

 Thanks