How to get last Updated Row property of a Gridview.

Question

I have created a Gridview by dragging a database table on my *.aspx page. This table has Many column like Id, Name, E-mail etc. I also add CommandField attribute ShowEditButton="true" of this Gridview. Now I need to access all the column entry which is last updated. I know I should use GridView1_RowUpdated Method, but don't know the code to retrieve every column entry. Please help me.
Same post I posted at codeProject.
http://www.codeproject.com/Questions/697830/How-to-get-Updated-Row-property-of-a-Gridview
But It's still not working.