when selected any checkbox item event not fired

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ASP.NET

C#3.5

protected void chkBoxListSpeciality_SelectedIndexChanged(object sender, EventArgs e)
    {
        pnlSpeciality.Visible = true;
        DataTable dt = new DataTable();       
            mycon.Open();
            if (chkBoxListSpeciality.SelectedValue != "")
            {
                SqlCommand cmd = new SqlCommand("GET_DOCTERDETAILS ", mycon);
                cmd.Parameters.AddWithValue("@spe", chkBoxListSpeciality.SelectedValue);
                cmd.Parameters.AddWithValue("@loc", txtloc.Text);
                cmd.Parameters.AddWithValue("@citid", ddlCity.SelectedItem.Text);
                SqlDataAdapter da = new SqlDataAdapter(cmd);
                da.Fill(dt);
                if (dt.Rows.Count > 0)
                {
                    lvDoctor.DataSource = dt;
                    lvDoctor.DataBind();
                    pnldoctimg.Visible = false;
                    pnlhome.Visible = false;
                    pnlslideimg.Visible = false;
                }

            }
            else
            {
                ShowAlertMessage("No Records Found");
            }
            mycon.Close();  
        
    }

Stored Procedure:

ALTER PROCEDURE [dbo].[GET_DOCTERDETAILS]
(
  @loc VARCHAR(30),
  @spe VARCHAR(50),
  @cityid VARCHAR(20)
)
AS
BEGIN
	
	SELECT a.doctorid, a.firstname+a.lastname as Name,b.spename,a.hospitalname,a.addr,a.imgpath,c.city 
	FROM tbl_DoctorReg a
	INNER JOIN tbl_spe b on b.speid=a.specialityid
	INNER JOIN tbl_loc l on l.locid=a.locid
	INNER JOIN tbl_city c ON c.cityid=l.cityid  
	WHERE l.loc LIKE @loc+'%' AND b.spename LIKE @spe+'%' AND c.cityid=@cityid	 
	
END

public void Bind_chkBoxListSpeciality()
{
mycon = new SqlConnection(ConfigurationManager.ConnectionStrings["con"].ConnectionString);
mycon.Open();
SqlCommand cmd = new SqlCommand("select * from tbl_spe", mycon);
SqlDataReader dr = cmd.ExecuteReader();
chkBoxListSpeciality.DataSource = dr;
chkBoxListSpeciality.Items.Clear();
chkBoxListSpeciality.DataTextField = "spename";
chkBoxListSpeciality.DataValueField = "speid";
chkBoxListSpeciality.DataBind();
mycon.Close();
}

This is my CheckBoxList Bind Method which is fired when user search for a doctor