@Html.DropDownList("SabTvCategory", new SelectList(new List<string> { "TV" }))


<script>
    var sabCategoryUrl = '../Command/GetSabnzbdCategories';

    $('#SabTvCategory').focus(function () {
        $.ajax({
            type: "POST",
            url: sabCategoryUrl,
            data: jQuery.param({ host: '192.168.5.55', port: 2222, apiKey: '5c770e3197e4fe763423ee7c392c25d1', username: 'admin', password: 'pass' }),
            error: function (req, status, error) {
                $.each($('#SabTvCategory option'), function () {
                    $(this).remove();
                });

                $('#SabTvCategory').append($('<option />').val('tv').text('Please check your SABnzbd Settings'));
            },
            success: function (data, textStatus, jqXHR) {
                //Get the current value
                var currentlySelected = $('#SabTvCategory').val();

                //Remove all existing options
                $.each($('#SabTvCategory option'), function () {
                    $(this).remove();
                });

                //Add the new ones
                $.each(data.categories, function () {
                    $('#SabTvCategory').append($('<option />').val(this.toString()).text(this.toString()));
                });

                //Attempt to reset to the preiously selected value (change to lower-case)
                $("#SabTvCategory").val(currentlySelected.toLowerCase());
            }
        });
    });
</script>