Check Box Control using combo box

private void chkSameAs_CheckedChanged(object sender, System.EventArgs e)
        {
            try
            {
                if (cboPresentDivision.Value != null)
                {
                    if (chkSameAs.Checked == true)
                    {
                        if (cboPresentDivision.Value != null)
                        { cboPermanentDivision.Value = cboPresentDivision.Text.Trim().ToString(); }
                        if (cboPresentDistrictZila.Value != null)
                        { cboPermanentDistrictZila.Value = cboPresentDistrictZila.Text.ToString(); }
                        if (cboPresentUpazilaThana.Value != null)
                        { cboPermanentUpazilaThana.Value = cboPresentUpazilaThana.Text.Trim().ToString(); }
                        if (cboPresentUnionWard.Value != null)
                        { cboPermanentUnionWard.Value = cboPresentUnionWard.Text.Trim().ToString(); }
                        if (cboPresentMouzaMohollah.Value != null)
                        { cboPermanentMauzaMoholla.Value = cboPresentMouzaMohollah.Text.Trim().ToString(); }
                        if (cboPresentVillage.Value != null)
                        { cboPermanentVillage.Value = cboPresentVillage.Text.Trim().ToString(); }
                        txtPermanentRoadHouse.Text = txtPresentRoadHouse.Text;
                    }
                    else
                    {
                        cboPermanentDivision.Value = string.Empty;
                        cboPermanentDistrictZila.Value = string.Empty;
                        cboPermanentUpazilaThana.Value = string.Empty;
                        cboPermanentUnionWard.Value = string.Empty;
                        cboPermanentMauzaMoholla.Value = string.Empty;
                        cboPermanentVillage.Value = string.Empty;
                        txtPermanentRoadHouse.Text = string.Empty;
                        cboPermanentDivision.DataSource = null;
                        cboPermanentDistrictZila.DataSource = null;
                        cboPermanentUpazilaThana.DataSource = null;
                        cboPermanentUnionWard.DataSource = null;
                        cboPermanentMauzaMoholla.DataSource = null;
                        cboPermanentVillage.DataSource = null;
                    }
                }
                else { objGeneral.MsgBox("Please select GEO Code value.", MessageBoxIcon.Information); }
            }
            catch (Exception ex) { objGeneral.MsgBox(ex.Message); }