Hi Taresh,
You can use ItemDataBound Event to update a particular item.
<asp:datalist id="" runat="server" onitemdatabound="DataListItemEventHandler" xmlns:asp="#unknown">
</asp:datalist>
proctected void OnRowDataBound(object sender, DataListItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
DropDownList ddlQuantity = ((DropDownList)(e.Item.FindControl("dd_quntity"))) ;
if (currValue.Equals("0"))
{
ddlQuantity.Visible = false;
}
else
{
ddlQuantity.Visible = true;
}
}
}