private void tsmiSaleAccount_Click(object sender, EventArgs e)
{
Form frm = new frmAccount(frmMain.user);
frm.MdiParent = this;
frm.Show();
}
private void tsmiSelectSale_Click(object sender, EventArgs e)
{
int id = (int)lvMessage.SelectedItems[0].Tag;
User u = UserManage.getUserById(id);
frmAccount frm = new frmAccount(u);
frm.Show();
}