Hide A LinkButton In DataList?

how to hide a LinkButton inside a DataList? I've tried to do this but I do not work:

protected void Page_PreRender(object sender, EventArgs e)
{
foreach (var item in listanews)
{
DataList container = dlgestionenews;
if (string.IsNullOrEmpty(item.IdNews))
{
DataListItem itemdatalist = null;
foreach (DataListItem itemdl in container.Items)
{
foreach (Control control in itemdatalist.Controls)
{
if (control.GetType().FullName == "LinkButton")
{
((LinkButton)control).Visible = false;
}
}
}
}
}
}