private void btnAdd_Click(object sender, EventArgs e)
{
AccountDao acDao = new AccountDao();
if (txtEmployeeId.Text.Length > 0 && txtUsername.Text.Length > 0)
{
acDao.AddAccount(new Account(txtUsername.Text, txtUsername.Text, cboRole.SelectedIndex + 1, Convert.ToInt32(txtEmployeeId.Text)));
LoadTable();
}
}