dynamic data in gridview in asp.net 4.0

Question

Hi,

  I have bind the data table with 5 rows dynamically to a gridview.

  Girdview consists of 3 dropdownlists and  4 textboxes.

  I need to maintain the data in the gridview at roundtrip to the server.

  I have kept gridview in update panel.

  I have functionality that I need to add new row to the gridview.

  At this time I am unable to maintain the data of first 5 rows in gridview.

  Please help me in solving the issue