Cannot locate 'id' value in database table when selecting column checked in UI (checkbox)

Please help. This is for a UI I have worked on for about 6 weeks for my company's Client Services team that is itching to use it.

As in the title, I am trying to select an 'ID' value associated with a row that contains a checkbox. If that checkbox is 'checked' I want a select statement to run and grab the 'ID' value from that row.

protected void UpdateSelectedRecords()
{
  string strPerSignStart = "%";
  string strPerSignEnd = "%";
  string strDbSearch = strPerSignStart + ddlDatabasesUpdateTCID.Text +       strPerSignEnd;
  object NewTCID = txtTargetCID.Text;

  DateTime curtstmp = DateTime.Now;

  foreach (GridViewRow row in GridView1.Rows) 
  {
    if (row.RowType == DataControlRowType.DataRow)
    {
       chkBox = (row.Cells[0].Controls[0] as CheckBox);

       if (chkBox != null && Convert.ToBoolean(chkBox.Checked) == true)
       {
         OdbcConnection Postgreconnect2 = new OdbcConnection("Driver=   {PostgreSQL   Unicode};Server=localhost;Port=5433;Database=postgres;Uid=xxx;Pwd=xxx");

         Postgreconnect2.Open();

         OdbcCommand cmd = new OdbcCommand("SELECT id FROM conceptidmapping WHERE database ILIKE " + "?" + " AND " + (chkBox.Checked == true) + " ORDER BY id ASC", Postgreconnect2);
         cmd.Parameters.AddWithValue("@database", strDbSearch);
         cmd.Parameters["@database"].Value = Convert.ToString(strDbSearch);
         cmd.Connection = Postgreconnect2;
         string idVal = (string)cmd.ExecuteScalar();


         OdbcCommand cmd1 = new OdbcCommand("UPDATE conceptidmapping SET selected = true WHERE database ILIKE " + "?" + " AND id = " + idVal, Postgreconnect2);
         cmd1.Parameters.AddWithValue("@database", strDbSearch);
         cmd1.Parameters["@database"].Value = Convert.ToString(strDbSearch);
         cmd1.Connection = Postgreconnect2;
         cmd1.ExecuteNonQuery();
        }
      }
    }
  }