public static PagoPendienteBL GetInstance()
        {
            if (singletonInstance == null)
                singletonInstance = new PagoPendienteBL();

            return singletonInstance;
        }
 /// <summary>
 /// constructor
 /// </summary>
 public FrmRegistroPagoPendienteSinCCSS()
 {
     this.pagoPendienteBL =  PagoPendienteBL.GetInstance();
     this.colaboradorBL =  ColaboradorBL.GetInstance();
 }