<div class="form-group">
<label asp-for="MODELNAME" class="col-md-2 control-label"></label>
<div class="col-md-10">
<select asp-for="MODELNAME" asp-items="Html.GetEnumSelectList<MODELNAME>()">
<option selected="selected" value="">Please select</option>
</select>
<span asp-validation-for="MODELNAME" class="text-danger" />
</div>
</div>