Get multiple images from database

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C#

Anyone with help i want to get multiple images from database via business logic and diplay on a gridview when i bind this method with gridview using object datasource, it does not workout.

      public List<vote> get_images()
      {
          csDAL objdal = new csDAL();
          List<vote> objparlist = new List<vote>();
          IDataReader dr = null;
          dr = objdal.executespreturndr("Get_All");
          {
              while (dr.Read())
              {
                  vote objc = new vote();
                  populate_bal(dr, objc);
                  objparlist.Add(objc);
              }
          }
          return objparlist;
      }

private void populate_bal(System.Data.IDataReader dr, vote objc)
      {
          objc.id = dr.GetInt32(0);
          objc.candidateName = dr.GetString (1);
          objc.candidateSurname = dr.GetString(2);
          objc.candidatePic = (Byte[])dr.GetValue(3);
          objc.standingyear = dr.GetString(4);
      }