how to adding dynamically multiple rows to gridview

hi,

please help me.i really really need help.i follow this code. http://www.aspsnippets.com/Articles/Adding-Dynamic-Rows-in-ASP.Net-GridView-Control-with-TextBoxes.aspx it works.thanks! but the example is show only for 1 row..come to my case when user want 12 rows for the first time gridview row load.i manage to add it by using for loop. but i stuck at the how to set previous data when user add new row to 13th row.the gridview seems like refresh and the entered data is gone!   help me!! please...i need to submit today   regards, musiw.