Keeping tasks after rerunning the app

Hello all, 

I'm working on a task app with the SfKanban control and everything is going well (so far). Well, there is no point to the program if a users tasks doesn't save when they close the application and re-run it. How can I set this up / implement it with your control? That way the tasks are actually saved. It'd be very helpful, thank you! C# language too by the way :)

<kanban:SfKanban Margin="10" ItemsSource="{Binding Tasks}" CardDragEnd="SfKanban_CardDragEnd"></kanban:SfKanban>

private void SfKanban_CardDragEnd(object sender, KanbanDragEndEventArgs e)          {              var kanbanModel = e.SelectedCard;                var targetTitle = e.TargetColumn.Title;              var targetColumnIndex = e.TargetColumnIndex;              var targetRowIndex = e.TargetRowIndex;          }

Hi, thank you for the reply! 

So, I don't think I worded my question correctly, so I'll try and be short and sweet (hopefully): 

When I close the application, the tasks I created disappear when I re-run the application. Is there a way to keep these tasks in the program even after it closes, that way when the user opens up their application, all of the tasks they created are there. 

Would this be solved with a database that stores each task? I don't have much work in that area, but could try it if it's the only way. Do you know of another?