asp.net core Razor pages @Html.DropDownListFor selected value as Input

Question

How do I use the selected value from @Html.DropDownListFor for OnPost input value?

 

@Html.DropDownListFor(x => Model.HazardsListEdit.SelectedHazClassId,
            new SelectList(Model.HazardsListEdit.HazardsClasses, "Value", "Text"),
            htmlAttributes: new { @class = "form-control", id = "HazClass", @required = true })

 

<input hidden asp-for="HazId.HazClass" value=" " />