public List <Facturas> ListopeAño()
 {
     try
     {
         List <Facturas>  _ListEstCartera = new List <Facturas>();
         PROC_CLEINTES_DB pros            = new PROC_CLEINTES_DB();
         DataTable        dt = new DataTable();
         dt = pros.FACT_ULT_AÑO();
         _ListEstCartera = (from DataRow dr in dt.Rows
                            select new Facturas()
         {
             MES1 = dr["MES"].ToString(),
             VALOR = Int64.Parse(dr["VALOR"].ToString())
         }).ToList();
         return(_ListEstCartera);
     }
     catch (Exception Exc)
     {
         throw Exc;
     }
 }