problem when deleting rows in gridview in update panel

Question

hi all i have gridview and iwant to delete rows, the gridview in update panel. i take the code from http://www.aspsnippets.com/post/2009/10/17/Select-and-delete-multiple-rows-in-ASPNet-Gridview-control.aspx and its work without update panel, but when i want to use it in update panel the updatepanel refreshed without deleting any rows can any one help me?