How do I OPEN a stored excel file in SQL Server 2008 via C#

I have stored an excel file in my SQL Server 2008 DB (as a VARBINARY(MAX)) the following (so far, hard coded) way:

// C# - visual studio 2008
var update = new SqlCommand("UPDATE Requests SET Attachment = @xls" +
        " WHERE RequestsID = 27", conn);
     update.Parameters.AddWithValue("xls", File.ReadAllBytes("C:/aFolder/hello.xlsx"));
     update.ExecuteNonQuery();

It works, but I want to open it too!

How do I do that? Note, not read blob-data, but open the actual "hello.xlsx" file.

I have tried the following: http://dotnetsoldier.blogspot.com/2007/07/how-to-retrieve-blob-object-in-winforms.html I can see it works, as "Binary.Length" is exactly the size of my "hello.xlsx" when executing - but the file doesn´t open, and that´s my problem.

Please help me out!

EDIT: HERE IS THE CODE THAT I CURRENTLY USE TO "OPEN" THE SPREADSHEET:

SqlConnection conn =
        new SqlConnection
           (global::MY_PROJECT.Properties.Settings.Default.DB_1ConnectionString);

     conn.Open();

     SqlCommand Cmd = new SqlCommand("select Attachment from Requests where RequestsID = 27", conn);
     Cmd.CommandType = CommandType.Text;

     SqlDataReader Reader = Cmd.ExecuteReader(CommandBehavior.CloseConnection);
     //
     string DocumentName = null;
     FileStream FStream = null;
     BinaryWriter BWriter = null;
     //
   开发者_如何转开发  //
     //
     byte[] Binary = null;
     const int ChunkSize = 100;
     int SizeToWrite = 0;
     MemoryStream MStream = null;
     //
     while (Reader.Read())
     {
        DocumentName = Reader["Attachment"].ToString();
        // Create a file to hold the output.
        FStream = new FileStream(@"c:\" + DocumentName, FileMode.OpenOrCreate, FileAccess.Write);
        BWriter = new BinaryWriter(FStream);
        Binary = (Reader["Attachment"]) as byte[];
        SizeToWrite = ChunkSize;
        MStream = new MemoryStream(Binary);
        //
        for (int i = 0; i < Binary.GetUpperBound(0) - 1; i = i + ChunkSize)
        {
           if (i + ChunkSize >= Binary.Length) SizeToWrite = Binary.Length - i;
           byte[] Chunk = new byte[SizeToWrite];
           MStream.Read(Chunk, 0, SizeToWrite);
           BWriter.Write(Chunk);
           BWriter.Flush();
        }
        BWriter.Close();
        FStream.Close();
     }
     FStream.Dispose();

     conn.Close();

The code you posted looks like it probably writes the spreadsheet to disc but I can't see any code to open it. You would need to use something like

System.Diagnostics.Process.Start(@"c:\" + DocumentName)

I think.