private void btnRandom_Click(object sender, EventArgs e)
 {
     if (CheckChanged())
     {
         desculpa = new Excuse(random, pasta);
         UpdateForm(false);
     }
 }
        private void btnAbrir_Click(object sender, EventArgs e)
        {
            if (CheckChanged())
            {
                OpenFileDialog ofd = new OpenFileDialog();
                ofd.InitialDirectory = pasta;
                ofd.Filter = "Excuse|*.excuse|Todos|*.*";

                DialogResult result = ofd.ShowDialog();

                if (result == DialogResult.OK)
                {
                    desculpa = new Excuse(ofd.FileName);
                    UpdateForm(false);
                }
            }
        }