public DataRow[] allnivel()
{
DataTable dt = obj_nivel.get_nivel();
DataRow[] rows = null;
if (dt.Rows.Count > 0)
{
rows = new DataRow[dt.Rows.Count];
for (int i = 0; i < dt.Rows.Count; i++)
{
rows[i] = dt.Rows[i];
}
}
return(rows);
}