tree view hierarchy in asp.net

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trees

lt_value_full
==================
CMD.ED.CE.SENorth.TA.EEGUL.DAGUL.AEEBAGA.JE1BAGA.devoorvd
CMD.ED.CE.SENorth.TA.EEGUL.DAGUL.AEEGUL.JE2GUL.meranna
CMD.ED.CE.SESouth.TA.EEBNG1.DABNG1.AEEKOL.JE1KOL.trivikrama
CMD.ED.CE.SESouth.TA.EEBNG.DABNG.AEEBNG2.AE1BNG2.jampanacons
CMD.ED.CE.SESouth.TA.EEMYS.DAMYS.AEEMNG.AE2MNG.pramods
CMD.ED.CE.SESouth.TA.EEMYS.DAMYS.AEEMNG.AE2MNG.mvpatil

string username = (string)(Session["UserAuthentication"]);

            DataSet dstreeviewprj = null;
            if (obj.load_treevieww(out dstreeviewprj, username))
            {

                if (dstreeviewprj.Tables[0].Rows.Count > 0)
                {

                    rootnode = new TreeNode(Session["UserAuthentication"].ToString());
                    trvgetresource.Nodes.Add(rootnode);
                    int cn = dstreeviewprj.Tables[0].Rows.Count;

                    for (int i = 0; i < cn; i++)
                    {
                        string heir = dstreeviewprj.Tables[0].Rows[i]['lt_value_full'].ToString();
                        string[] hyarraypre = heir.Split('.');
}
}
}

i want to construct treeview using lt_value_full using parent child concept.........
like: if login with senorth then senorth as root node under senorth,, ta under ta,,eegul.....