Question

I just started with WPF. Moved from Window Form.

Where do those openDialog, saveDialog gone? And a bunch of stuff.

Answer 1

Look in Microsoft.Win32 namespace

OpenFileDialog openDialog = new OpenFileDialog();
if (openDialog.ShowDialog().Value)
{
      ..........
}

And the same for SaveFileDialog

SaveFileDialog saveDialog = new SaveFileDialog();
if (saveDialog.ShowDialog().Value)
{
      ..........
}