private void FrmEstadisticas_Load(object sender, EventArgs e)
{
this.FormBorderStyle = FormBorderStyle.FixedSingle;
this.MaximizeBox = false;
lblTotal.Text = "Recaudacion Total: $" + misFacturas.total();
nudAño.Maximum = DateTime.Today.Year;
nudAño.Value = DateTime.Today.Year;
cbMes.SelectedIndex = 0;
cbDiaDeHoy.Checked = true;
FacturasTotales = misFacturas.listarFacturas().Count;
}