I have a view that displays a list of records in a table. I want to be able to select different AttendanceStatusId values via a SelectList drop-down, one per table record. The following code updates the AttendanceStatusId value if I hardcode a value, such as

episodeSanction
    .GetType()
    .GetProperty("AttendanceStatusId")?
    .SetValue(episodeSanction, new Guid("01920309-1939-2930-93482930"));

But if I try:

episodeSanction
    .GetType()
    .GetProperty("AttendanceStatusId")?
    .SetValue(episodeSanction, episodeSanction.AttendanceStatusId);

it just uses the existing value, meaning no updated value.

if (!await Update(vm))
{
    SetNotification("Error updating the database.");

    vm.AttendanceList = await SelectListBuilder.GetList("AttendanceStatus");

    return View($"{ViewBase}/Attendance.cshtml", vm);
}

public async Task<bool> Update(SanctionViewModel vm)
{
    var model = await _db.Sanctions.FindAsync(vm.Sanction.Id);

    await _db.Entry(model).Collection(x => x.EpisodeSanctions).LoadAsync();

    foreach (var episodeSanction in model.EpisodeSanctions)
    {
        episodeSanction
            .GetType()
            .GetProperty("AttendanceStatusId")?
            .SetValue(episodeSanction, episodeSanction.AttendanceStatusId);
    }

    return await UpdateDatabaseAsync(_db);
}

<td class="text-center">
    <div class="form-group">
        <select class="form-control" id="Sanction.EpisodeSanctions_[@i]_AttendanceStatusId" name="Sanction.EpisodeSanctions[@i].AttendanceStatusId">
            <option value=""></option>
            @foreach (var attendance in Model.AttendanceList)
            {
                <option [email protected] @if (attendance.Value == attendanceStatus) { <text> selected="selected" </text>  }>
                    @attendance.Text
                </option>
            }
        </select>
        @Html.FormValidationMessageFor(m => m.Sanction.EpisodeSanctions.ToArray()[i].AttendanceStatusId)
    </div>
</td>