<Window xmlns:syncfusion="clr-namespace:Syncfusion.Windows.Controls.Notification;assembly=Syncfusion.SfBusyIndicator.WPF"
        x:Class="BusyIndicatorApp.MainWindow">
    <Grid Background="CornflowerBlue">
        <syncfusion:SfBusyIndicator IsBusy="True"
                                     AnimationType="Flight"
                                     Header="Loading..."
                                     Foreground="White"/>
    </Grid>
</Window>

<Grid>
    <syncfusion:SfBusyIndicator IsBusy="{Binding IsLoading}"
                                 AnimationType="DoubleCircle"
                                 Header="{Binding LoadingMessage}"/>
</Grid>

public class MainViewModel : INotifyPropertyChanged
{
    private bool _isLoading;
    public bool IsLoading
    {
        get => _isLoading;
        set { _isLoading = value; OnPropertyChanged(); }
    }
    
    private string _loadingMessage = "Please wait...";
    public string LoadingMessage
    {
        get => _loadingMessage;
        set { _loadingMessage = value; OnPropertyChanged(); }
    }
    
    public async Task LoadDataAsync()
    {
        IsLoading = true;
        LoadingMessage = "Loading data...";
        
        await Task.Delay(3000); // Simulate operation
        
        IsLoading = false;
    }
}

public class DataViewModel : ViewModelBase
{
    private bool _isBusy;
    public bool IsBusy
    {
        get => _isBusy;
        set => SetProperty(ref _isBusy, value);
    }
    
    public ICommand LoadCommand { get; }
    
    public DataViewModel()
    {
        LoadCommand = new RelayCommand(async () => await LoadDataAsync());
    }
    
    private async Task LoadDataAsync()
    {
        IsBusy = true;
        try
        {
            var data = await _dataService.GetDataAsync();
            // Process data
        }
        finally
        {
            IsBusy = false;
        }
    }
}

<StackPanel>
    <ComboBox x:Name="AnimationSelector" SelectedIndex="0">
        <ComboBoxItem Content="Flight"/>
        <ComboBoxItem Content="DoubleCircle"/>
        <ComboBoxItem Content="Spin"/>
    </ComboBox>
    
    <syncfusion:SfBusyIndicator IsBusy="True"
                                 AnimationType="{Binding ElementName=AnimationSelector, 
                                                Path=SelectedItem.Content}"/>
</StackPanel>

<Grid>
    <!-- Main content -->
    <ContentControl Content="{Binding MainContent}"/>
    
    <!-- Overlay busy indicator -->
    <Grid Background="#80000000" 
          Visibility="{Binding IsBusy, Converter={StaticResource BoolToVisibilityConverter}}">
        <syncfusion:SfBusyIndicator IsBusy="{Binding IsBusy}"
                                     AnimationType="Ball"
                                     Header="Processing..."
                                     Foreground="White"
                                     ViewboxHeight="150"
                                     ViewboxWidth="150"/>
    </Grid>
</Grid>

<syncfusion:SfBusyIndicator IsBusy="{Binding IsProcessing}">
    <syncfusion:SfBusyIndicator.HeaderTemplate>
        <DataTemplate>
            <StackPanel>
                <TextBlock Text="{Binding CurrentOperation}" 
                          FontSize="14" FontWeight="Bold"/>
                <TextBlock Text="{Binding ProgressPercentage, StringFormat='Progress: {0}%'}"
                          FontSize="11" Margin="0,5,0,0"/>
            </StackPanel>
        </DataTemplate>
    </syncfusion:SfBusyIndicator.HeaderTemplate>
</syncfusion:SfBusyIndicator>