Append multiple rows

Hi,

How can i append the rows in a xml / csv file to an existing grid?

Say i have 10 rows in a grid already. And i want to read another 10 rows from a xml / csv file.

Is there a way to do so?

It possible for XML only.
mygrid.updateFromXML(url,true);
such command will read target url and will add any row defined in XML and not existing in grid.