public void loadsession()
    {
        try
        {
            ds.Clear();
            cbl_sessionname.Items.Clear();

            string itemheader = "";
            for (int i = 0; i < cbl_hostelname.Items.Count; i++)
            {
                if (cbl_hostelname.Items[i].Selected == true)
                {
                    if (itemheader == "")
                    {
                        itemheader = "" + cbl_hostelname.Items[i].Value.ToString() + "";
                    }
                    else
                    {
                        itemheader = itemheader + "'" + "," + "" + "'" + cbl_hostelname.Items[i].Value.ToString() + "";
                    }
                }
            }
            if (itemheader.Trim() != "")
            {
                //string selecthostel = "select distinct Session_Code,Session_Name  from Session_Master where Hostel_Code in ('" + itemheader + "')";
                //ds = d2.select_method_wo_parameter(selecthostel, "Text");

                ds = d2.BindSession_inv(itemheader);
                if (ds.Tables[0].Rows.Count > 0)
                {
                    cbl_sessionname.DataSource     = ds;
                    cbl_sessionname.DataTextField  = "SessionName";
                    cbl_sessionname.DataValueField = "SessionMasterPK";
                    cbl_sessionname.DataBind();
                    if (cbl_sessionname.Items.Count > 0)
                    {
                        for (int i = 0; i < cbl_sessionname.Items.Count; i++)
                        {
                            cbl_sessionname.Items[i].Selected = true;
                            cb_sessionname.Checked            = true;
                        }
                        txt_sessionname.Text = "Session Name(" + cbl_sessionname.Items.Count + ")";
                    }
                }
                else
                {
                    txt_sessionname.Text = "--Select--";
                }
            }
            else
            {
                txt_sessionname.Text = "--Select--";
            }
        }
        catch
        {
        }
    }