投票gridview里柱状百分比显示

1.后台代码，通过手写方法，得到投票所占百分比：
public int FormatVoteCount(String voteCount, string voteTotal)
    {
        if (voteCount.Length <= 0 || voteTotal.Length <= 0)
        {
            return (0);
        }
        int nVoteTotal = Int32.Parse(voteTotal);
        if (nVoteTotal > 0)
        {
            return ((Int32.Parse(voteCount) * 100 / nVoteTotal));
        }
        return (0);
    }

    public int FormatVoteImage(int voteCount)
    {
        return (voteCount * 3);
    }

2.gridview里面绑定的，并且调用方法：
 <ItemTemplate>
                                <asp:Image ID="voteImage" Runat="server" Height="20"
                                    ImageUrl="~/images/Votes.png"
                                    Width='<%# FormatVoteImage(FormatVoteCount

(DataBinder.Eval(Container.DataItem,"VoteCount").ToString(),DataBinder.Eval

(Container.DataItem,"SumVoteCount").ToString()))%>' />
                                    <%# FormatVoteCount(DataBinder.Eval(Container.DataItem,

"VoteCount").ToString(), DataBinder.Eval(Container.DataItem, "SumVoteCount").ToString())%>%
                            </ItemTemplate>