CSS Class for DropDownListFor - asp.net-mvc

Question

Using scaffolded items in an MVC5 application, I see things like text fields given the CSS class "form-control". The fields all have consistent rounded corners, same font color/size etc.
Now I've added a dropdown list using "#Html.DropdownListFor" and it's square, with a different font colour.
I know I can specify which CSS class to use in the Razor e.g.
#Html.DropDownListFor(model => model.OrderItemTypeId, (SelectList)ViewBag.OrderItemTypes, new { htmlAttributes = new { #class = "###########" } })
But I don't know what to replace ########### with. If I specify "form-control" just gives me the square box I described above. "form-control select" doesn't seem to do much either.
Here's a bigger snippet showing a well-styled text field directly above it
<div class="form-group">
#Html.LabelFor(model => model.Title, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.Title, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.Title, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.OrderItemTypeId, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.DropDownListFor(model => model.OrderItemTypeId, (SelectList)ViewBag.OrderItemTypes, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.OrderItemType, "", new { #class = "text-danger" })
</div>
</div>
Is there a value I can use that will give my dropdown the same appearance as all the other text fields I already have?
Thanks

Answer 1

The third parameter already is the htmlAttributes field, so your syntax is wrong. This is what you're after:
#Html.DropDownListFor(model => model.OrderItemTypeId,
(SelectList)ViewBag.OrderItemTypes,
new { #class = "form-control etc" })
See Microsoft Docs.

Answer 2

You need to make sure it sits within proper hierarchy of outer tags with their corresponding classes.
See the code below that I took from this article - How to use Bootstrap 3 validation states with ASP.NET MVC Forms
<div class="row">
<div class="col-sm-4 col-sm-offset-4">
<div class="panel panel-default">
<div class="panel-body">
#using (Html.BeginForm("UserProfile", "Profile", FormMethod.Post, new { role = "form", id="userForm" })) {
#* State selection dropdown *#
<div class="form-group">
#Html.LabelFor(m => m.State)
#Html.DropDownListFor(m => m.State, // Store selected value in Model.State
// This argument needs some explanation - here we take a Distionary<string, string>
// and turn it into an instance of SelectList, see blog post for more details
new SelectList(Model.States, "Key", "Value"),
// Text for the first 'default' option
"- Please select your state -",
// A class name to put on the "<select>"
new { #class = "form-control" }
)
#Html.ValidationMessageFor(m => m.State)
</div>
<button type="submit" class="btn btn-primary">Update</button>
}
</div>
</div>
</div>
</div>