private void button1_Click(object sender, EventArgs e)
        {
            if (!pwInfo.PasswordIsCorrect(this.textBoxOld.Text))
            {
                MessageBox.Show("The current password is wrong!", "Wrong password");
                DialogResult = DialogResult.None;
            }
            else if (this.textBoxNew.Text.Length < 8)
            {
                MessageBox.Show("Password must be at least 8 characters.", "Password too short");
                DialogResult = DialogResult.None;
            }
            else if (string.IsNullOrEmpty(this.textBoxNew.Text) || this.textBoxNew.Text != this.textBoxNewConfirmed.Text)
            {
                MessageBox.Show("Please enter and confirm a new valid password!", "Confirm");
                DialogResult = DialogResult.None;
            }

            else if (this.textBoxNew.Text == this.textBoxOld.Text)
            {
                MessageBox.Show("Please enter a different password.", "Different password");
                DialogResult = DialogResult.None;
            }
            else
            {
                pwInfo.ChangePassword(this.textBoxOld.Text, this.textBoxNew.Text, Convert.ToUInt32(this.numericUpDown1.Value));
                pwInfo.Save(this.passwordFilePath);

                MessageBox.Show("Password successfully changed!", "Success");

                DialogResult = DialogResult.OK;
            }
        }