Alphanumeric sorting using LINQ in ASP.Net

Hi,

I have a list of data that need to display inside DataTable.

When displaying the data, the sorting for that page is not working for data > 999.

My data look like this FY21_998 FY21_999 FY21_1000 FY21_1001

When sorting it will show FY21_999 as highest when i sort by descending.

My code looks like this.

var tableAdmin = db.Requesters.OrderByDescending(e => e.Requester_id).ToList();
ViewBag.AdminTable = tableAdmin;

<script type="text/javascript" class="init">
    $(document).ready(function () {
        $('#datatable').DataTable({
            "order": [[7, "asc"], [3, "desc"]],
            "lengthMenu": [[20, 40, 80, -1], [20, 40, 80, "All"]],
            columnDefs: [
                { type: 'natural', targets: 0 }
            ]
        });

        $('#dataTable2').DataTable({
            "order": [1, "desc"],
        });
    });
</script>
<table id="datatable" style="width:100%" cellspacing="0">
    foreach (var item in ViewBag.AdminTable)
    {
        bla..bla..bla.. 
    }
</table>