Problem filtering value in ASP MVC entity framework

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ASP

ASP.NET

MVC5

entity-framework

hello,

I am using ASPP MVC and Entity Framework. I want to include a Filter by Price in my Project. I get alwaya an Error of

Quote:

Nullable object must have a value.

What I have tried:

This is the code in my View :

@{
    var fromPrice = ViewBag.fromPrice as Decimal?;
    var toPrice = ViewBag.toPrice as Decimal?;
}

@using (Html.BeginForm("FiltredPrice", "Home", FormMethod.Get))
{
    <div>From Price: @Html.TextBox("fromPrice", fromPrice.Value))</div>
    <div>To Price: @Html.TextBox("toPrice", toPrice.Value))</div>
    <input type="submit" value="Search" />
}

and this is what I tried in my Controller :

public ActionResult FiltredPrice(Decimal? fromPrice, Decimal? toPrice)
        {

            if (!fromPrice.HasValue) fromPrice = Decimal.Zero;
            if (!toPrice.HasValue) toPrice = fromPrice.GetValueOrDefault(Decimal.Zero+1);
            if (toPrice < fromPrice) toPrice = fromPrice.GetValueOrDefault(Decimal.Zero + 1);
            ViewBag.fromDate = fromPrice;
            ViewBag.toDate = toPrice;

            var voitures = db.Voitures
              .Where(c => c.Price >= fromPrice && c.Price < toPrice)
              .ToList();
            return View(voitures);
        }