[DefaultValue("")]
[Parameter]
public string MarkerId { get; set; }

<DxMap Provider="MapProvider.Azure"
       Zoom="18"
       Width="950px"
       Height="400px"
       MarkerClick="OnMapMarkerClick" >
    <DxMapApiKeys Azure="@MapApiKeyProvider.GetAzureProviderKey()" />
    <DxMapMarkers>
        <DxMapMarker MarkerId="BusStation" IconUrl="images/bus-station-mark.png" >
            <DxMapMarkerLocation GeoPosition="51.481633,-0.008281" />
        </DxMapMarker>
        <DxMapMarker MarkerId="GiftShop" IconUrl="images/shop-mark.png">
            <DxMapMarkerLocation GeoPosition="51.480889,-0.009259" />
        </DxMapMarker>
    </DxMapMarkers>
    <DxMapRoutes>
        <DxMapRoute Color="red" Weight="9" Mode="MapRouteMode.Walking">
            <DxMapRouteLocations>
                <DxMapRouteLocation GeoPosition="51.481633,-0.008281" />
                <DxMapRouteLocation GeoPosition="51.481186,-0.009107" />
                <DxMapRouteLocation GeoPosition="51.480889,-0.009259" />
            </DxMapRouteLocations>
        </DxMapRoute>
    </DxMapRoutes>
</DxMap>
@code {
    void OnMapMarkerClick(MapMarkerClickEventArgs e) {
        switch(e.Marker.MarkerId) {
            case "BusStation":
                ShowBusStationInformation();
                break;
            case "GiftShop":
                ShowShopInformation();
                break;
        }
    }
    // ...
}