How to import all xml files to gridview

I am doing windows application. here my requirment is

1) I have one folder , in that folder all xml files are there.
now I want show all xml files in gridview when ever click on the button.

Here all xml files structure is same.

2) Here also I have on folder in drive. I have one checked list box and button
In page load i want to display all Xml files in Checked list box after that
I will select multiple files in checked list box.
When ever click on the button , I want to show those xml files in gridview.

Please provide the code.