private void btnAgregar_Click(object sender, EventArgs e)
        {
            fmAlta alta = new fmAlta(); // creo la ventana

            alta.ShowDialog();          // abro la ventana
            Cargar();
        }
        private void btnModificar_Click(object sender, EventArgs e)
        {
            Articulos art;

            art = (Articulos)dgvGrilla.CurrentRow.DataBoundItem;
            fmAlta modificar = new fmAlta(art);

            modificar.ShowDialog();
            Cargar();
        }
        private void dgvGrilla_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
        {
            Articulos art;

            art = (Articulos)dgvGrilla.CurrentRow.DataBoundItem;
            fmAlta modificar = new fmAlta(art, false);

            modificar.ShowDialog();
            Cargar();
        }