Need help in datagrid control

Question

Hi all, I need some help in data grid control. I have placed a datagrid control on the form. There are different fields along with them i have two buttons "Add New" and "Delete". 
If I click "Add New" button, a row at the bottom should be created, can anyone tell me how to add row at the bottom of the grid. And after adding it should be editable also.. 

Also one question. I have added a datagrid buy giving datagrid.datasource=list, at runtime Im not able to edit the datagrid content. Is there any property to make the datagrid editable.


Im really new to .Net, I have come from C background.
Can anyone give me sample example so that I can get my stuff working..

Thanks in advance..