Databinding not working.

Question

Hi All,

I have used one XMLfile as data source for my datagrid in a WPF.

 

Please see attached files

 

Everything works good in designer, and I can see the datagrid is populated with data. But on runtime its not loading, just an empty datagrid.
Please have a look and help me.

 

The code worked very well on runtime also, but something happened now its not showing anything. That's why I am wondering!!. I have tried modifying the XAML in different ways but no hope.Please consider as I am a begginer in WPF and XAML.