Thread and loading animation

Hi 

I am a beginner in C # WPF. I have two problems that I want to share with you so that you can help me 
In one part of my application I have a textbox a button on my form. 
On button click, I make a query on the database and I execute other tasks. 
The execution time is a little long before the results are displayed. 

So I would like to display the message "Please wait, loading" for the user during treatment. and also display a gif file (loading) next to the message. 
I would like the message in a label next to my textbox and not in another window or dialog. 
I read on the forums that i have to use threads but I don' t understand  it properly. 


I finally found a code that m 'solved the problem half.

public static void ForceUIToUpdate()
        {
            DispatcherFrame frame = new DispatcherFrame();

            Dispatcher.CurrentDispatcher.BeginInvoke(DispatcherPriority.Render, new DispatcherOperationCallback(delegate(object parameter)
            {
                frame.Continue = false;
                return null;
            }), null);

            Dispatcher.PushFrame(frame);
        }
		
		private void Button_Click_4(object sender, RoutedEventArgs e)
        {


           this.pictureBoxLoading.Visibility = System.Windows.Visibility.Visible;
         this.status.Content= "Please wait, loading";
           ForceUIToUpdate();
// function for long treat
		   runCode();
          md.Visibility = System.Windows.Visibility.Collapsed;
          this.pictureBoxLoading.Visibility  = System.Windows .Visibility .Collapsed ;
            this.status.Content= "";
          }

My xaml code

<Grid x:Name="AddboxGrid"  Grid.Row ="1" Background="#FFB6B6B6" Height="80" ><Grid   Margin="0,1,0,0" Width="229" Background="#FFE8E8E8" HorizontalAlignment="Left" VerticalAlignment="Top" Height="79" ><TextBox  x:Name="url_or_rss" Style="{StaticResource StandardPlaceholder }"  HorizontalAlignment="Left" Height="23"  TextWrapping="NoWrap"    VerticalAlignment="Top" Width="219"   BorderBrush="#FFB6B6B6" BorderThickness="1" Margin="4,7,0,0" Foreground="#FF3A3939"/><Button Content="Add"  Style="{StaticResource btnStyle}"  HorizontalAlignment="Left" Margin="180,41,0,0" VerticalAlignment="Top" Width="42" Click="Button_Click_4" Height="23" FontSize="12"/><Label Content="1" Name="Addbox" HorizontalAlignment="Left" Margin="39,39,0,0" VerticalAlignment="Top" Visibility="Collapsed"/><Label Content="" Name="status" HorizontalAlignment="Right" Margin="0,43,79,0" VerticalAlignment="Top" Width="130"/><WindowsFormsHost   x:Name="pictureBoxLoading" Margin="-11,36,188,6" Width="20" Height="18"  ><wf:PictureBox x:Name="picture" ImageLocation="E:\3.gif" Height="10"    /></WindowsFormsHost></Grid>

I found it easy and the result is what I wanted except that the GIF is no longer running, the image remains static. 
But if I 'use image on other grid, it runs well. 

then I wonder if the code that I found was the right solution for my problem. 
If so how could I turn my gif (animated picture) during the processing of the transaction. 

If not, what code should be used to get best  Result.

Thanks for your help

AS