Example of ViewBag Usage

Example.cshtml

<select asp-for="Group" asp-items="ViewBag.Options">
     <option>Please select an Option</option>
</select>

ExampleController.cs

public async Task<IActionResult> CreateGroup()
{
     // Create a select list with the "B" option selected
     ViewBag.Options = new SelectList(new string[]{ "A", "B", "C" }, "B");
     return View();
}