private void btnSignUp_Click(object sender, EventArgs e)
{
this.Close();
DangKy frmDangKy = new DangKy(this);
frmDangKy.StartPosition = FormStartPosition.CenterParent;
frmDangKy.ShowDialog(this);
}
private void menuSignUp_Click(object sender, EventArgs e)
{
DangKy frmDangKy = new DangKy(this);
frmDangKy.StartPosition = FormStartPosition.CenterParent;
frmDangKy.ShowDialog(this);
updateListUser();
}