odbcConnection1.Open();
odbcCommand1.CommandText = "select blob_data from forward..blob_test where blob_id = 500000053";
byte[] data2 = (byte[])odbcCommand1.ExecuteScalar();
FileStream ss = new FileStream("c:\\123.bmp", FileMode.CreateNew, FileAccess.Write);
ss.Write(data2,  0 , data2.Length);
ss.Flush();
ss.Close();