Myujth

I have a parent container (form) that initializes a new TabPage with a user control inside of it (called from the Menu Strip). The Tab Control has a Context Menu that, when you right click and select "Close Selected Tab", I call a method that Removes that tab. However, it does not stop the code within that TabPage's user control from running. How can I clean this up so when I close the Tab (TabPages.Remove... etc) that it also closes the user control within that TabPage so that any background code stops executing?

The code below is what closes the tab:
The latter part just selects the next tab to the left after the tab is removed.

 public static void closeCurrentTab(TabControl tc)
 
 int curTabIndex = tc.SelectedIndex;
 TabPage tp = tc.SelectedTab;
 tc.TabPages.Remove(tp);
 if(curTabIndex > 0)
 
 tc.SelectedTab = tc.TabPages[(curTabIndex - 1)];
 
 

I found the issue. I found that the asynchronous processes within the child control were running astray even after the parent control (in this case being the TabPage) was disposed of.

A simple example of how I solved it is below.

Also, for more complex task chaining , I can introduce cancellation tolkens once the parent becomes null, thus cleaning up whatever needs to be once a user closes a tab hosting that control, but doesnt close the overall application.

using this.Parent and testing whether it is null or not whevenever id like to.

 protected override void OnParentChanged(EventArgs e)
 
 base.OnParentChanged(e);
 if(this.Parent == null)
 
 // Clean up

 
 

and or this

 private async Task popUp()
 
 do
 
 MessageBox.Show("Im running!");
 await Task.Delay(5000);
 
 while (this.Parent != null);