How to implementing xamarin Forms Checkbox in list view for deleting checked rows only

I have a list view retrieving data from web api. i have added checkboxes to each row. now i want to delete only the checked rows. How can it be done?

My Xaml file:

        <StackLayout VerticalOptions="CenterAndExpand">
            <ListView x:Name="postsListView" ItemSelected="postsListView_ItemSelected" HasUnevenRows="True">
                <ListView.ItemTemplate>
                    <DataTemplate>
                        <ViewCell>
                            <Grid>
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="*"/>
                                    <ColumnDefinition Width="3*"/>
                                    <ColumnDefinition Width="3*"/>
                                    <ColumnDefinition Width="3*"/>
                                </Grid.ColumnDefinitions>
                                <Grid.RowDefinitions>
                                    <RowDefinition Height="*"/>
                                    <RowDefinition Height="*"/>
                                </Grid.RowDefinitions>
                                <!--Data From Web Api-->
                                <controls:CheckBox x:Name="checkbox2" x:Uid="{Binding Id}"  Checked="False" Grid.Row="0" Grid.Column="0"/>
                                <Label Grid.Row="0" Grid.Column="1" Text="{Binding Name}"/>
                                <Label Grid.Row="0" Grid.Column="2" Text="{Binding Address}"/>
                                <Label Grid.Row="0" Grid.Column="3" Text="{Binding Telephone}"/>
                            </Grid>
                        </ViewCell>
                    </DataTemplate>
                </ListView.ItemTemplate>
            </ListView>
        </StackLayout>

I am unable to implement the listeners and the delete operations. i need to delete only selected checked rows. MyXaml.cs File:

    private String Url = "http://192.168.8.115/NewAPI/api/Employee_Table";
    private HttpClient client = new HttpClient();
    private ObservableCollection<Employee> _employee;
    Employee _Employee = new Employee();


    public AddRecordPage ()
    {
        InitializeComponent ();            
    }

    protected override async void OnAppearing()
    {
        var response = await client.GetStringAsync(Url);
        var Emp = JsonConvert.DeserializeObject<List<Employee>>(response);
        _employee = new ObservableCollection<Employee>(Emp);
        postsListView.ItemsSource = _employee;
        base.OnAppearing();
    }