private void AlterarPwButton_Click(object sender, EventArgs e)
        {
            string novaPw = textBox4.Text;

            if (novaPw.Length < 8)
            {
                toolStripStatusLabel1.Text = "A password tem de ter no minimo 8 caracteres.";
            }
            else if (RegisterForm.CharEspeciais(novaPw))
            {
                toolStripStatusLabel1.Text = "A password contem caracteres especiais.";
            }
            else
            {
                int indice = dataGridView1.CurrentCell.RowIndex;

                string[] read = File.ReadAllLines(fileUsers);
                string[] ut   = read[indice].Split(';');

                string ln = ut[0] + ';' + ut[1] + ';' + novaPw + ';' + ut[3] + ';' + ut[4];

                ModFich(indice, ln);
                toolStripStatusLabel1.Text = "Password alterada com sucesso.";
            }
        }