private void btndelete_Click(object sender, EventArgs e)
        {
            if (!(GridExaminar.CurrentRow == null))
            {
                if (MessageBox.Show("Desea eliminar datos de cliente ...?"
                                    + txtmnruc.Text.Trim() + "-" + txtnomdetalle.Text.Trim(), "Mensaje del Sistema", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button1) == DialogResult.Yes)
                {
                    try
                    {
                        var BL = new clienteBL();
                        var BE = new tb_cliente();

                        BE.ctacte = GridExaminar.Rows[GridExaminar.CurrentRow.Index].Cells["ctacte"].Value.ToString();

                        if (BL.Delete(VariablesPublicas.EmpresaID.ToString(), BE))
                        {
                            GridExaminar.Rows.Remove(GridExaminar.CurrentRow);
                            GridExaminar.Refresh();
                        }
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                }
            }
            U_RefrescaControles();
        }