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What event is for when app is already open?

I have a Page_Load event which contains the code I want executing every time the user opens the application. However, when a user clicks the back button on their Windows device, the application is still open, so when they go onto the application the Page_Load event is not called.
I've also tried an OnNavigatedTo event:
protected override void OnNavigatedTo(NavigationEventArgs e)
{
InitialStartOfApp();
}
But the InitialStartOfApp() doesn't get called. I know it doesn't get called because I try debugging the line, however it isn't executed.
Does anyone know any events that would resolve this or any ideas?
The Page_Load event is this:
private void Page_Loaded(object sender, RoutedEventArgs e)
{
InitialStartOfApp();
}

You need handle the Application.Resuming event that is raised when the apps continues after a previous suspension.
Application app = Application.Current;
app.Resuming += App_Resuming;
...
private void App_Resuming(object sender, object e) {
InitialStartOfApp();
}

Start process and Stop process buttons

I spent many days in this problem but have not found a solution.
I have a button that the user uses to starts a process that can take several minutes. This process does some calculations and at the end I have to see the end result in a textbox.
There must be another button to stop the process. If the user stops the process before the process is finished, I have to see the partial result in the textbox.
How can I do?
I tried to use a timer and an updatepanel but I could not find a solution.
protected void buttonStart_Click(object sender, EventArgs e)
{
for (j=0;j<1000;j++) //it lasts some minutes...
{
textbox1.text = j //it's only an example to understand what I need...
if (stopped==true) return;
}
}
protected void buttonStop_Click(object sender, EventArgs e)
{
stopped=true;
}

Timer to refresh charts in c#

I have created a chart which receives its data from a SQL Server database. Whenever I save new data into the database, all the reports get updated, but the chart does not update until I exit the application and log in again. I decided to use Timer in C# to automatically refresh the chart every 5 seconds.
//this is to invoke the timer as soon as the application launches.
public MDIParent2()
{
InitializeComponent();
myTimer.Enabled = true;
myTimer.Start();
}
//this is my timer event
private void myTimer_Tick(object sender, EventArgs e)
{
this.Refresh();
MessageBox.Show("Refreshed!");//this was added to determine if the timer is working
}
//this lets me stop the timer
private void button1_Click(object sender, EventArgs e)
{
myTimer.Stop();
}
//this lets me resume the timer
private void button2_Click(object sender, EventArgs e)
{
myTimer.Start();
}
I get the message "Refreshed!" every 5 seconds, but chart is still not refreshed. Can someone please assist?

replace this.refresh() with [Chart Object].refresh()

Process.Start to open multiple web pages

I am currently using a simple button to open a webpage.
void ReportingClick(object sender, EventArgs e)
{
System.Diagnostics.Process.Start("http://www.google.ca");
}
What I want to do is get it to open 3 pages at once with the one click and I am having a hard time getting it to work. I have tried multiple Process.start lines
void ReportingClick(object sender, EventArgs e)
{
System.Diagnostics.Process.Start("http://www.google.ca");
System.Diagnostics.Process.Start("http://www.gmail.com");
System.Diagnostics.Process.Start("http://www.stackoverflow.com");
}
and even adding multiple pages into the handler.
void ReportingClick(object sender, EventArgs e)
{
System.Diagnostics.Process.Start("http://www.google.ca","http://www.gmail.com","http://www.s tackoverflow.com")
}
It will only open the last page in the list in both cases. Any ideas?

If IE is open, your code works fine and opens each link in a new tab, if not, I was able to make it work by making the app wait for 1 sec before calling the second page to open:
void ReportingClick(object sender, EventArgs e)
{
System.Diagnostics.Process.Start("http://www.google.ca");
System.Threading.Thread.Sleep(1000);
System.Diagnostics.Process.Start("http://www.gmail.com");
System.Threading.Thread.Sleep(1000);
System.Diagnostics.Process.Start("http://www.stackoverflow.com");
}

ShowDialog, PropertyGrid and Timer problem

I have a strange bug, please, let me know if you have any clues about the reason.
I have a Timer (System.Windows.Forms.Timer) on my main form, which fires some updates, which also eventually update the main form UI. Then I have an editor, which is opened from the main form using the ShowDialog() method. On this editor I have a PropertyGrid (System.Windows.Forms.PropertyGrid).
I am unable to reproduce it everytime, but pretty often, when I use dropdowns on that property grid in editor it gets stuck, that is OK/Cancel buttons don't close the form, property grid becomes not usable, Close button in the form header doesn't work.
There are no exceptions in the background, and if I break the process I see that the app is doing some calculations related to the updates I mentioned in the beginning.
What can you recommend? Any ideas are welcome.

What's happening is that the thread timer's Tick method doesn't execute on a different thread, so it's locking everything else until it's done. I made a test winforms app that had a timer and 2 buttons on it whose events did this:
private void timer1_Tick(object sender, EventArgs e)
{
Thread.Sleep(6000);
}
private void button1_Click(object sender, EventArgs e)
{
timer1.Start();
}
private void button2_Click(object sender, EventArgs e)
{
frmShow show = new frmShow();
show.ShowDialog(); // frmShow just has some controls on it to fiddle with
}
and indeed it blocked as you described. The following solved it:
private void timer1_Tick(object sender, EventArgs e)
{
ThreadPool.QueueUserWorkItem(DoStuff);
}
private void DoStuff(object something)
{
Thread.Sleep(6000);
}