You can count items and display "and" instead of "," for the last item. To test I have this markup:
<asp:Repeater ID="Repeater1" runat="server" OnItemDataBound="Repeater1_ItemDataBound">
<ItemTemplate>
<%# Container.DataItem %>
</ItemTemplate>
<SeparatorTemplate>
<%# (Container.ItemIndex <((ArrayList)Repeater1.DataSource).Count - 2?",":" and ") %>
</SeparatorTemplate>
</asp:Repeater>
And my code:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ArrayList values = new ArrayList();
values.Add("James");
values.Add("Bob");
values.Add("Joe ");
values.Add("Banana");
values.Add("Frank");
Repeater1.DataSource = values;
Repeater1.DataBind();
}
}
And my output: