MVC : Display Value Insteadof The Id

Question

Hi,

I want to Display Username instead of Userid but it should take the Userid Value

I have 2 tables : AspNetUsers and AspNetUserRoles 

ViewData["UserId"] = new SelectList(_context.AspNetUsers, "Id", "Id");

<div class="form-group">
                <label asp-for="UserId" class="control-label"></label>
                <select asp-for="UserId" class="form-control" asp-items="ViewBag.UserId"></select>
</div>