Checkboxlist - Add values to Database

Question

Hi,
    I have check box list in a page. I generate values for this check box  list from database in pageload as follows:

 CheckBoxList2.DataSource = objRegLogic.GetSPList("SP_Allergy");

                CheckBoxList2.DataTextField = "name";

                CheckBoxList2.DataValueField = "pkey";

                CheckBoxList2.DataBind();

  I want to add these checkboxlist value in to database in a button click.I use the following code.But when debugging " if (CheckBoxList2.Items[i].Selected == true)"  this condition can't work properly. Even i checked one item it doesn't enter in to the loop

 Can u please check this code,whether i did any wrong??

protected void labtestbtn_Click(object sender, EventArgs e)

        {

            ConsultingEntity objConsEntity = new ConsultingEntity();

            PatientConsultingBLLLogic objPatConsBLL = new PatientConsultingBLLLogic();

            string Pid = Request.QueryString["PID"] as string;

            if (Pid == null || Pid == string.Empty)

            {

                Pid = ddlPatient.SelectedValue;

            }

            string DocID = Convert.ToString(Session["pkey"]);

            if (DocID == null || DocID == string.Empty)

            {

                DocID = ddldoc.SelectedValue;

            }

            try

            {

                if (Pid == "")

                {

                }

                else

                {

                    for (int i = 0; i < CheckBoxList2.Items.Count; i++)

                    {

                        if (CheckBoxList2.Items[i].Selected == true)

                        {

                            string labtest = item.Value;

                            objConsEntity.LabTest = labtest;

                            objConsEntity.Doctorid = Convert.ToInt16(DocID);

                            objConsEntity.PatientId = Convert.ToInt16(Pid);

                            objPatConsBLL.InsertPatientLapTest(objConsEntity);

                         

                        }

                    }

                } 

               

            }

            catch (Exception ex)

            {

            }

         

        }

I didn't understand where is the wrong. Can anyone help me to do this?