CheckBoxFor in Razor with MySQL bit value

Could you help me please? I have in my database MySQL Bit fields (1), I do the Model and I work it in the controller with true or false ( Boolean ), until then everything is fine. In Razor I call my field like this:

@Html.CheckBoxFor(model => model.Almacenamiento.Value)

In my table MySQL the values are defaulted to 0, in the view it correctly shows the CheckBox according to the value of MySQL , if in MySQL is at 0 the CheckBox appears unmarked , if it is 1 the CheckBox is marked, until then everything is fine.

My problem is when I save or edit, since when I see the view and I want to mark or unmark a CheckBox in the database to update me, in the controller when the object arrives and I look at that field, that field arrives as null . I do not know if he let me understand. Some help? What I want is that when editing and saving, the controller reaches its field as true or false but only arrives as null .

This is how it is the properties of the class in my data model:

    public Nullable<bool> IngresoSite { get; set; }
    public Nullable<bool> IngresoNodoInterconexion { get; set; }
    public Nullable<bool> Almacenamiento { get; set; }
    public Nullable<bool> PruebaConectividad { get; set; }
    public Nullable<bool> IngresoFibraGabinete { get; set; }
    public Nullable<bool> IngresoEquipoTX { get; set; }

are several.  and that's how I get it in the controller:

  

[Authorize] [HttpPost]       public ActionResult DiagramTransmission (Transmission objTrans) {here I only receive the object and I start to operate, but in the property   that mention only appears null. return View (); }

This is how it is the properties of the class in my data model:

    public Nullable<bool> IngresoSite { get; set; }
    public Nullable<bool> IngresoNodoInterconexion { get; set; }
    public Nullable<bool> Almacenamiento { get; set; }
    public Nullable<bool> PruebaConectividad { get; set; }
    public Nullable<bool> IngresoFibraGabinete { get; set; }
    public Nullable<bool> IngresoEquipoTX { get; set; }

are several.  and that's how I get it in the controller:

  

[Authorize] [HttpPost]       public ActionResult DiagramTransmission (Transmission objTrans) {here I only receive the object and I start to operate, but in the property   that mention only appears null. return View (); }