basic question

[ronald]

What is wrong with thsi code? why the busy indicator does not show up?

<Window xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"  x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid HorizontalAlignment="Stretch">

        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition />
        </Grid.RowDefinitions>

        <telerik:RadButton Click="Button_Click" Grid.Row="0" HorizontalAlignment="Center" Content="Load Appointments" FontWeight="Bold" Margin="12" Padding="18 4" />
        <telerik:RadBusyIndicator x:Name="busyIndicator" Grid.Row="1" BusyContent="Loading data....">
            <Button Height="34" Width="90" Content="xxx"/>
        </telerik:RadBusyIndicator>

    </Grid>
</Window>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            busyIndicator.IsBusy = true;

            System.Threading.Thread.Sleep(100000);

            busyIndicator.IsBusy = false;

        }
    }
}

[Teodor]

Hi Ronald,

Thank you for contacting us.

In the Button_Click event handler you are sleeping the thread (System.Threading.Thread.Sleep(100000)), which causes the UI to become inresponsive and thus prevents the RadBusyIndicator to show its busy indication. 

You can change the method like:

private void Button_Click(object sender, RoutedEventArgs e)
        {
            busyIndicator.IsBusy = !busyIndicator.IsBusy;
        }

In this way you will be able to toggle the IsBusy property between true and false. 
 
Hope this helps. Let us know in case you have further help.

Best wishes,
Teodor
the Telerik team

[ronald]

then i need to implement muthithread/asynchronous method call to use the busy indicator?!

[Teodor]

Hi Ronald,

Executing long-running operations in the background is the best approach because thus they do not block the UI thread. See this demo to see this implemented using a BackgroundWorker.

Hope this helps.

Kind regards,
Teodor
the Telerik team