MVC set dropdownlist value to bool

[HexElffilter]

I'm having difficulty trying to get an MVC form to post with valid data.

I have narrowed it down to two dropdownlists on the page.
The values that it binds to in my model page is a boolean.

Code from Model

        [Required(ErrorMessage="Please select Yes or No")]
        public bool Annonymous { get; set; }

        [Required(ErrorMessage="Please select Yes or No")]
        public bool TakeFurther { get; set; }

Code to setup DropDownList from Controller

        private void DropDownReBind()
        {
            List<SelectListItem> SelYN = new List<SelectListItem>();

            SelYN.Add(new SelectListItem
            {
                Text = "Yes",
                Value = "1"
            });
            SelYN.Add(new SelectListItem
            {
                Text = "No",
                Value = "0"
            });

            ViewData["selYN"] = SelYN;
        }

Code from View

        <table>
            <tr>
                <td class="editor-label">
                    Would you like to speak to someone from student services?
                </td>
                <td class="editor-field">
                    @Html.DropDownListFor(model => model.Annonymous, (IEnumerable<SelectListItem>)ViewData["selYN"], "-- Please Select --")
                    @Html.ValidationMessageFor(model => model.Annonymous)
                </td>
            </tr>
            <tr>
                <td class="editor-label">
                    Do you want to be contacted to discuss this matter further?
                </td>
                <td class="editor-field">
                    @Html.DropDownListFor(model => model.TakeFurther, (IEnumerable<SelectListItem>)ViewData["selYN"], "-- Please Select --")
                    @Html.ValidationMessageFor(model => model.TakeFurther)
                </td>
            </tr>
        </table>

On post the validation fails I guess it is trying to use a string instead of a boolean, can I change the postback value in the ModelState before the page is validated?

Code for Post in Controller

        [HttpPost]
        public ActionResult Create(StudentIncident studentincident)
        {
            if (ModelState.IsValid)
            {
                studentincident.ID = Guid.NewGuid();
                db.StudentIncidents.Add(studentincident);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            DropDownReBind();

            return View(studentincident);
        }