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public static class DBHelper{
public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
  {
  SqlCommand cmd = new SqlCommand();
  SqlConnection conn = new SqlConnection(connectionString);
  try
  {
  PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
  SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
  cmd.Parameters.Clear();
  return rdr;
  }
  catch
  {
  conn.Close();
  conn.Dispose();
  throw;
  }
  }
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