private bool kiemtra()
{
if (ma.Text == "")
{
ma.Focus();
return(false);
}
if (ten.Text == "")
{
ten.Focus();
return(false);
}
if (computer.SelectedIndex == -1)
{
computer.Focus();
return(false);
}
s_nhomkho = "";
for (int i = 0; i < nhomkho.Items.Count; i++)
{
if (nhomkho.GetItemChecked(i))
{
s_nhomkho += dtnhom.Rows[i]["id"].ToString().Trim() + ",";
}
}
s_makho = "";
for (int i = 0; i < makho.Items.Count; i++)
{
if (makho.GetItemChecked(i))
{
s_makho += dtkho.Rows[i]["id"].ToString().Trim() + ",";
}
}
return(true);
}