Navigator.pop( context, new MaterialPageRoute( builder: (BuildContext context) => new DashBoard())), code example
Example: flutter push and pop doesnt work
PROBLEM: flutter push and pop doesnt work
SOLUTION:
You are using MaterialApp more then one time in your project, you should only have one instance of MaterialApp
as it holds your root configuration.
Ctrl + Shift+ F type MaterialApp Search and try to remove MatrialApp with Scaffold
you need to provide only one MaterialApp. And it shoud work...