private void button6_Click(object sender, EventArgs e)
{
Historial h = new Historial();
h.tipo = "producto";
this.Dispose();
h.ShowDialog();
}
private void button4_Click_1(object sender, EventArgs e)
{
Historial h = new Historial();
h.tipo = "pedido";
this.Dispose();
h.ShowDialog();
}