Select List Selected .NET Core

Question

I have and String in ViewBag.SubjectName="Hindi"

 

How Get Selected Item Select in Select List Selected .NET Core

 

<div>Subject :@foreach (var t in ViewBag.SubjectName)

{@t} , Topic : @foreach (var t in ViewBag.TopicName)

{@t} </div>

<div class="col-md-4">

<form asp-action="EditSubTopic">

<div asp-validation-summary="ModelOnly" class="text-danger"></div>

<input type="hidden" asp-for="SubTopicID" />

<div class="form-group">

<label class="control-label"></label>

<select id="SubjectID" class="form-control" asp-items="@(new SelectList(@ViewBag.SubjectList,"SubjectID","SubjectName"))"></select>

</div>

<div asp-validation-summary="ModelOnly" class="text-danger"></div>

<div class="form-group">

<label asp-for="TopicID" class="control-label"></label>

<select asp-for="TopicID" class="form-control" asp-items="@(new SelectList(string.Empty,"TopicID","TopicDisplayName"))"></select>

</div>