public int AddNewImageToDemande(
   int dem_id,
   byte[] image,
   string text
) {

   this.DBCommand.CommandText = "INSERT INTO IMAGES (IMG_ID, DEM_ID, IMG_BINARIES, IMG_TEXT) "   
      + "VALUES(SEQ_IMAGES.NEXTVAL, :DEM_ID, :IMG_BINARIES, :IMG_TEXT)";
   this.DBCommand.CommandType = CommandType.Text;
   if (this.useTransaction)
      this.DBCommand.Transaction = (OracleTransaction)trans;
      this.DBCommand.Parameters.Clear();
      this.DBCommand.Parameters.Add("DEM_ID", OracleType.Number);
      this.DBCommand.Parameters.Add("IMG_TEXT", OracleType.Clob);
      this.DBCommand.Parameters.Add("IMG_BINARIES", OracleType.Blob);
      this.DBCommand.Connection = this.oraConn;

      this.DBCommand.Parameters["DEM_ID"].Value = dem_id;
      if (text == string.Empty) {
         this.DBCommand.Parameters["IMG_TEXT"].Value = OracleLob.Null;
      } else {
         this.DBCommand.Parameters["IMG_TEXT"].Value = text.Replace("'","''");
      }
      this.DBCommand.Parameters["IMG_BINARIES"].Value = image;
      return this.DBCommand.ExecuteNonQuery();
   }
}

public byte[] FileToBytes(string filename)
{
   if (!File.Exists(filename)) 
   {
      return null;
   }

   FileStream fs = new FileStream(filename, FileMode.Open);
   BinaryReader stream = new BinaryReader(fs);
   byte[] bytes = stream.ReadBytes(stream.BaseStream.Length);
   stream.Close();
   fs.Close();
   return bytes;
}