AsyncFileUpload and repeater - asp.net

Question

I have an asyncfileupload control and a repeater that I would like to use to show list of added files. On FileUploadedComplete event I add the new file's name and size to a data table and use it to bind the repeater. I can select a file and add it (SaveAs()), add the info to data table (I can see it is there) but after calling repeater's databind() nothing happens, can't see the file data.
This is what I have (watered down version):
<asp:UpdatePanel runat="server" ID="upnlFU">
<ContentTemplate>
<ajaxToolkit:AsyncFileUpload
runat="server"
ID="fuAttchedDocs"
ThrobberID="myThrobber"
UploaderStyle="Modern"
onuploadedcomplete="fuAttchedDocs_UploadedComplete"
onuploadedfileerror="fuAttchedDocs_UploadedFileError" />
<asp:Repeater runat="server" ID="rptAttachments">
<HeaderTemplate>
<table>
<tr>
<td>File Name</td>
<td>File Size</td>
</tr>
</HeaderTemplate>
<ItemTemplate>
<tr>
<td><%# Eval("FileName")%></td>
<td><%# Eval("FileSize")%></td>
</tr>
</ItemTemplate>
<FooterTemplate>
</table>
</FooterTemplate>
</asp:Repeater>
</ContentTemplate>
</asp:UpdatePanel>
Code behind:
DataTable dtAttachments;
protected void Page_Load(object sender, EventArgs e)
if (!Page.IsPostBack)
{
dtAttachments = new DataTable();
dtAttachments.Columns.Add("FileName", Type.GetType("System.String"));
dtAttachments.Columns.Add("FileSize", Type.GetType("System.Int32"));
dtAttachments.AcceptChanges();
}
else
{
dtAttachments = (DataTable)ViewState["Attachments"];
}
BindAndSaveAttachmentData();
}
void BindAndSaveAttachmentData()
{
ViewState["Attachments"] = dtAttachments;
rptAttachments.DataSource = dtAttachments;
rptAttachments.DataBind();
}
protected void fuAttchedDocs_UploadedComplete(object sender, AsyncFileUploadEventArgs e)
{
string sFileName = fuAttchedDocs.FileName;
string sFileSize = e.FileSize;
fuAttchedDocs.SaveAs(FilePath.TEMP_FOLDER + sFileName); // Saving to d:\blah\yada temporary folder
dtAttachments.Rows.Add(new object[] { sFileName, int.Parse(sFileSize) });
BindAndSaveAttachmentData();
}
Both file upload and repeater are inside an update panel.