投票系统 查看投票功能(ASP.NET C#)

在做查看投票功能时，显示所占总票百分比这个功能无法成功实现。请各位高手们帮帮我。附我运行后的图。显示百分比这个图没有实现成功。
前台界面部分代码:
<Columns>
<asp:BoundField DataField="Item" HeaderText="投票项目" SortExpression="Item" />
<asp:BoundField DataField="VoteCount" HeaderText="票数" SortExpression="VoteCount" />
<asp:BoundField HeaderText="所占总票百分比" />
<asp:TemplateField>
<ItemTemplate>
<asp:Image ID="VoteImage" runat="server" Height="20" Width='<%#FormatVoteImage(FormatVoteCount
(DataBinder.Eval(Container.DataItem,"VoteCount").ToString())) %>' ImageUrl="~/image/VOTE.gif" />
<%#FormatVoteCount(DataBinder.Eval(Con

<Columns>
<asp:BoundField DataField="Item" HeaderText="投票项目" SortExpression="Item" />
<asp:BoundField DataField="VoteCount" HeaderText="票数" SortExpression="VoteCount" />
<asp:BoundField HeaderText="所占总票百分比" />
<asp:TemplateField>
<ItemTemplate>
<asp:Image ID="VoteImage" runat="server" Height="20" Width='<%#FormatVoteImage(FormatVoteCount
(DataBinder.Eval(Container.DataItem,"VoteCount").ToString())) %>' ImageUrl="~/image/VOTE.gif" />
<%#FormatVoteCount(DataBinder.Eval(Container.DataItem,"VoteCount").ToString()) %>%
</ItemTemplate>
</asp:TemplateField>
</Columns>后台代码:
public partial class ShowVote : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}