Find Repeater control in a function

Hello all, I am trying to bind my anchor tag from database value which is inside my repeater.

here is my repeater :

<div class="popular_deals">
<div class="head">
<div class="popular_deals_heading">Popular Dealsdiv>
<div class="item">
<asp:Repeater ID="rptdealsbanner" runat="server" OnItemDataBound="rptdealsbanner_ItemDataBound">
<HeaderTemplate>
<ul id="autoplay" class="content-slider">
HeaderTemplate>
<ItemTemplate>
<li id="mylist">
<a target="_blank" id="bannerAnchor">
<img src='<%#"PopularDeals/"+ Eval("BannerName") %>' alt='<%# Eval("BannerName") %>' />
a>
<%-- <asp:ImageButton ID="imgBanner" runat="server" alt="Banner Image">asp:ImageButton>
<asp:HiddenField ID="hdnBannerName" runat="server" Value='<%# Bind("BannerName") %>' />
<asp:HiddenField ID="lblurl" runat="server" Value='<%# Bind("BannerURL") %>'>asp:HiddenField>--%>
li>
ItemTemplate>
<FooterTemplate>
ul>
FooterTemplate>
asp:Repeater>
div>
div>
div>

My code behind:

private void GetDealsBanner()
{
try
{
BLPopularDeals objPD = new BLPopularDeals();
DataSet ds = objPD.GetDealsBanner(CountryFromCookies);
if (ds.Tables[0].Rows.Count > 0)
{
for(int i=0;i
{
HtmlAnchor a1 = (HtmlAnchor)rptdealsbanner.FindControl("mylist").FindControl("bannerAnchor"); //here i am getting null error ... how do i find my anchor tag and bind data ??
a1.HRef = ds.Tables[0].Rows[i]["BannerURL"].ToString() != null
? ds.Tables[0].Rows[i]["BannerURL"].ToString()
: "#";
}
rptdealsbanner.DataSource = ds.Tables[0];
rptdealsbanner.DataBind();
}
}
catch (Exception ex)
{
new TicketingError().Error(ex, "Default1.aspx---- GetDealsBanner()");
}
}

Anybody help me out