FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);

        BinaryReader br = new BinaryReader(fs);

        FileInfo fi = new FileInfo(path);             

        byte[] imagedata = new byte[fs.Length];

        fs.Read(imagedata, 0, (int)fs.Length);

        try
        {                

            MyString = "UPDATE tabAllegatiCommessa SET ContenutoFile=(?) where NomeFile='" + NomeFile + "'";

            OleDbCommand InsertImage = new OleDbCommand(MyString, connection);
         
            OleDbParameter myParm2 = new OleDbParameter("?P1", SqlDbType.Image);
            myParm2.Value = imagedata; //is byte[]

            InsertImage.Parameters.Add(myParm2);

            connection.Open();

            InsertImage.ExecuteNonQuery();

            connection.Close();

            br.Close();
            fs.Close();
        }
        catch (Exception ex)
        {
            Response.Write(ex.Message);
        }