dropdownlistfor not selecting value

I have a dropdown list in an MVC 5 razor view.  My model is passing through the correct value but the value is never selected in the list.  I am not sure what else I can do?

            public Nullable<int> state_province_id { get; set; }

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                        <div class="form-group">
                            @Html.LabelFor(m => addy.state_province_id, new { @class = "control-label col-md-3" })
                            @Html.DropDownListFor(m => addy.state_province_id, item.state_province_dropdown, "-- Select --", new { @class = "form-control" })

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Lokesh B RDeveloperCommented:

try this

 @Html.DropDownListFor(m => addy.state_province_id, item.state_province_dropdown.Value, "-- Select --", new { @class = "form-control" })

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monica73174Author Commented:
Thanks for the suggestion but that just throws an error in Visual Studio.
Lokesh B RDeveloperCommented:
Check whether it has value or not.

 @Html.DropDownListFor(m => addy.state_province_id, item.state_province_dropdown.HasValue ? item.state_province_dropdown.Value : null, "-- Select --", new { @class = "form-control" })

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monica73174Author Commented:
Okay I ended up figuring it out, to get it to work I had to switch the view to look like this
                    @Html.DropDownListFor(m => addy.state_province_id, 
                                                  new SelectList(item.state_province_dropdown,
                                                       , "-- Select --"
                                                      , new { @class = "form-control" })

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