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KnockoutJs Observable Arrays and Dropdownlists
<script type="text/javascript">
    $(document).ready(function () {
        var sampleSubmission = function () {
            this.selectedPlatform = ko.observable();
            this.platforms = ko.observableArray();

            this.showSearch = ko.observable(false);
            this.craftText = ko.observable();
            this.showSerialNumber = ko.observable(0);

            this.selectedPlatform.subscribe(function (platformId) {


            } .bind(this));
        };

        var sampleSubmissionViewModel = new sampleSubmission();
        ko.applyBindings(sampleSubmissionViewModel);

        //Load the platforms
        $.ajax({
            url: '@Url.Action("GetPlatforms", "Home")',
            type: 'GET',
            success: function (data) {
                sampleSubmissionViewModel.platforms(data);
            }
        });
    });

</script>

<select data-bind="options: platforms, value: selectedPlatform, optionsText: 'name'"></select>