How to get multiselect

File.razor

    <MudTable Items="@(GetPlaces())" T="AreaPlace" Dense="true" @bind-SelectedItem="selectedItem1" Filter="new Func<AreaPlace,bool>(FilterFunc1)">
        <ToolBarContent>
            <MudItem xs="12" md="5">
                <MudTextField @bind-Value="searchString1" Placeholder="@L["Search"]" Adornment="Adornment.Start" AdornmentIcon="@Icons.Material.Filled.Search" IconSize="Size.Medium" Class="mt-0"></MudTextField>
            </MudItem>
            <MudSpacer/>
              <MudItem xs="12" md="4">
            <MudSelect T="string" @bind-SelectedValues="Options" @bind-Value="@tempArea" MultiSelection="true" Label="@L["Select Areas"]">
                    @foreach (var area in areas)
                    {
                        <MudSelectItem T="string" [email protected]/>
                    }
                </MudSelect>
                </MudItem>
        </ToolBarContent>
        <HeaderContent>
            <MudTh><b>@L["Area Name"]</b></MudTh>
            <MudTh><b>@L["Place Name"]</b></MudTh>
        </HeaderContent>
        <RowTemplate>
            <MudTd DataLabel=@L["Area Name"]>@context.AreaName</MudTd>
            <MudTd DataLabel=@L["Place Name"]>@context.PlaceName</MudTd>
        </RowTemplate>
    </MudTable>

public partial class AreaPlaceTable : ComponentBase
    {
        [Inject]
        DataManager<Area, ApplicationDbContext> AreaManager { get; set; }
        [Inject]
        private IStringLocalizer<LanguageService> L { get; set; }

        List<Area> areas=new();
        string tempArea;
        List<AreaPlace> locations=new();
        protected override async Task OnInitializedAsync()
        {
            areas = await AreaManager.Get();
            var data = await AreaManager.Get(includeProperties: "Places");
            locations = (from a in data from p in a.Places select new AreaPlace { AreaId=a.Id, AreaName=a.Name, PlaceId=p.Id, PlaceName=p.Name }).ToList();
            
        }
        private bool FilterFunc1(AreaPlace detail) => FilterFunc(detail, searchString1);
        private string searchString1 = "";
        private AreaPlace selectedItem1 = null;
        private static bool FilterFunc(AreaPlace detail, string searchString)
        {
            if (string.IsNullOrWhiteSpace(searchString))
                return true;
            if (detail.AreaName.Contains(searchString, StringComparison.OrdinalIgnoreCase))
                return true;
            if (detail.PlaceName.Contains(searchString, StringComparison.OrdinalIgnoreCase))
                return true;
            return false;
        }
        
        private IEnumerable<string> Options { get; set; } = new HashSet<string>() { };
        private List<AreaPlace> GetPlaces()
        {
            if (!Options.Any())
            {
                return locations;
            }
            return (from a in locations from o in Options where a.AreaName==o select a).ToList();
        }
    }