当复选框被禁用时，不应该进行更新

我有两个页面，一个是admin，另一个是faculty。行政分配科目给教员。教师只希望选择所需的小时数。我的问题是，我不想执行更新查询禁用复选框。我已经尝试了下面的代码，但它也在更新禁用复选框。

  using (SqlConnection con2 = new SqlConnection(ConfigurationManager.ConnectionStrings
    ["ConnectionString"].ConnectionString))
    {
    foreach (GridViewRow r in Gv1.Rows){
     if  ((((
     (((CheckBox)(Gv1.Rows[r.RowIndex].FindControl("chkHour1"))).Checked == true 
|| ((CheckBox)(Gv1.Rows[r.RowIndex].FindControl("chkHour1"))).Checked == false)
|| (((CheckBox)(Gv1.Rows[r.RowIndex].FindControl("chkHour2"))).Checked == true || ((CheckBox)(Gv1.Rows[r.RowIndex].FindControl("chkHour2"))).Checked == false)
|| (((CheckBox)(Gv1.Rows[r.RowIndex].FindControl("chkHour3"))).Checked == true || ((CheckBox)(Gv1.Rows[r.RowIndex].FindControl("chkHour3"))).Checked == false)
|| (((CheckBox)(Gv1.Rows[r.RowIndex].FindControl("chkHour4"))).Checked == true || ((CheckBox)(Gv1.Rows[r.RowIndex].FindControl("chkHour4"))).Checked == false)
|| (((CheckBox)(Gv1.Rows[r.RowIndex].FindControl("chkHour5"))).Checked == true || ((CheckBox)(Gv1.Rows[r.RowIndex].FindControl("chkHour5"))).Checked == false)
    ))))
    {
      SqlCommand comm;
      CheckBox aa;
      bool hour1 = (r.FindControl("chkHour1") as CheckBox).Checked;
      bool hour2 = (r.FindControl("chkHour2") as CheckBox).Checked;
      bool hour3 = (r.FindControl("chkHour3") as CheckBox).Checked;
      bool hour4 = (r.FindControl("chkHour4") as CheckBox).Checked;
      bool hour5 = (r.FindControl("chkHour5") as CheckBox).Checked;
      string subject1 = ddlsubj.SelectedValue;
      string subject2 = ddlsubj.SelectedValue;
      string subject3 = ddlsubj.SelectedValue;
      string subject4 = ddlsubj.SelectedValue;
      string subject5 = ddlsubj.SelectedValue;
      string datedif = r.Cells[0].Text;
      aa=(CheckBox)sender;
      con2.Open();
      comm = new SqlCommand();
      comm.Connection = con2;
      comm.CommandType = CommandType.Text;
      if (aa.Enabled==false)
      {
       comm = new SqlCommand("UPDATE test 
                              SET aa=false 
                              when subject1=CASE WHEN (@hour1)= 'false' THEN NULL
                              ELSE @subject1 END,
                              subject2=CASE WHEN (@hour2)= 'false' THEN NULL 
                             ELSE @subject2 END,
                             subject3=CASE WHEN (@hour3)= 'false' THEN NULL 
                             ELSE @subject3 END,
                             subject4=CASE WHEN (@hour4)= 'false' THEN NULL 
                             ELSE @subject4 END,
                             subject5=CASE WHEN (@hour5)='false' THEN NULL 
                             ELSE @subject5 END,
                             hour1 = CASE WHEN (@hour1)= 'false' THEN 'false' 
                             ELSE 'true' END, 
                             hour2 = CASE WHEN (@hour2)= 'false' THEN 'false' 
                             ELSE 'true' END, 
                             hour3 = CASE WHEN (@hour3)= 'false' THEN 'false' 
                             ELSE 'true' END , 
                             hour4 = CASE WHEN (@hour4)= 'false' THEN 'false' 
                             ELSE 'true' END , 
                             hour5 = CASE WHEN (@hour5)= 'false' THEN 'false' 
                            ELSE 'true' END  where datedif=@datedif", con2);
     }
       else
       {
                   comm = new SqlCommand("update test set aa=true 
                           when subject1=CASE WHEN (@hour1)= 'false' THEN NULL 
                           ELSE @subject1 END,
                           subject2=CASE WHEN (@hour2)= 'false' THEN NULL 
                           ELSE @subject2 END,
                           subject3=CASE WHEN (@hour3)= 'false' THEN NULL 
                           ELSE @subject3 END,
                           subject4=CASE WHEN (@hour4)= 'false' THEN NULL 
                           ELSE @subject4 END,
                           subject5=CASE WHEN (@hour5)='false' THEN NULL 
                           ELSE @subject5 END,
                           hour1 = CASE WHEN (@hour1)= 'false' THEN 'false' 
                           ELSE 'true' END, 
                           hour2 = CASE WHEN (@hour2)= 'false' THEN 'false' 
                           ELSE 'true' END, 
                           hour3 = CASE WHEN (@hour3)= 'false' THEN 'false' 
                           ELSE 'true' END , 
                           hour4 = CASE WHEN (@hour4)= 'false' THEN 'false' 
                           ELSE 'true' END , 
                           hour5 = CASE WHEN (@hour5)= 'false' THEN 'false' 
                            ELSE 'true' END  where datedif=@datedif", con2);
    }
    comm.Parameters.AddWithValue("@subject1",subject1);
    comm.Parameters.AddWithValue("@subject2", subject2);
    comm.Parameters.AddWithValue("@subject3", subject3);
    comm.Parameters.AddWithValue("@subject4", subject4);
    comm.Parameters.AddWithValue("@subject5", subject5);
    comm.Parameters.AddWithValue("@hour1", hour1);
    comm.Parameters.AddWithValue("@datedif", datedif);
    comm.Parameters.AddWithValue("@hour2", hour2);
    comm.Parameters.AddWithValue("@hour3", hour3);
    comm.Parameters.AddWithValue("@hour4", hour4);
    comm.Parameters.AddWithValue("@hour5", hour5);
    comm.ExecuteNonQuery();
    con2.Close();
       }
      } 
     }