private void btnDelete_Click(object sender, EventArgs e)
{
string id = dgvData.CurrentRow.Cells[0].FormattedValue.ToString().Trim();
switch (content)
{
case "NhanVien":
NhanVien.DeleteNhanVien(id);
LoadToDataGridView();
break;
case "HangHoa":
HangHoa.DeleteHangHoa(id);
LoadToDataGridView();
break;
}
}