Question

I need to save data in distinct TabItem every time when user switches to another tabitem.

I try to operate TabControl.SelectionChanged event, but there is no info about previously selected tab item.

So, how to get moment when user switches from my TabItem to another?

Answer 1

You can make a global variable to store what is the last tab

private TabPage LastTab = null;

private void tabSelectionChanged(...)
{
  if(LastTab != null)
     //Do save

  LastTab = tab.SelectedTabPage;// or equivalent 
}