Question

Can anyone suggest me a way to Append Listbox items when i already have items in my asp:listbox

so far I have tried this :

ListItem Li=new ListItem(objSubscriber.FirstName,objSubscriber
                                       .SubscriberID.ToString());
lstboxSubscribers.Items.Insert(lstboxSubscribers.Items.Count + 1, Li);

is there any way to find out last index of a listbox for the existing preloaded listbox? like LastIndexOf() or something similar

it’s throwing an indexoutofrange Exception
if more clarifications are required, I will provide it.
any workarounds?

Answer 1

ListBox1.Items.Count - 1 will return the lastIndex of ListBox

Set AppendDataBoundItems="true" and it will append the items in the existing listItems.

<asp:ListBox ID="ListBox1" runat="server" AppendDataBoundItems="true"></asp:ListBox>