Thanks a lot.
I tried and I got id when I clicked on listbox.
Sorry for my poor knowledge. I need to ask again.
Actually I need to get id of listbox in the same row when clicked on input button which is another column. Basically I need to get it onclick of below item ( refer the code I mentioned earlier ).
<asp:TemplateField HeaderText="Add Items">
<itemtemplate>
<input onclick="Javascript:MoveItem( 'need id of ListBox_Available_Items how to get it?' , 'need id of ListBox_CurItems' )" type="button" value="<-" />
</itemtemplate>
Basically get the id of a list box ( which exist in specific column of the row ) on click of a button ( which exist in another column of same row ).
Hope I am clear enough