Repeater 强制保留两位小数 

 <asp:Repeater ID="Repeater1" runat="server" onitemdatabound="Repeater1_ItemDataBound">            
      <HeaderTemplate>
        <table class="tb_Content" border="0" cellpadding="0" cellspacing="1">
        <tr class="tr_Top"><td colspan="29" align="center"><b>项目跟踪管理表</b></td></tr>
        <tr class="tr_Top">
          <td align="center" style="width:100px;"><b>到款金额</b></td>
        </tr>
      </HeaderTemplate>
      <ItemTemplate>
        <tr class="tr_Content">            
          <td align="center"><%#Eval("BilingCount").ToString().Equals(string.Empty) ? "0.00" :Eval("BilingCount","{0:f}")%></td>
        </tr>
       </ItemTemplate>
      <FooterTemplate>
        <tr class="tr_Content"> 
          <td align="center"><%#BilingCount.Equals(0) ? "0.00" :String.Format("{0:f}",BilingCount)%></td>                      
        </tr>
      </table>
      </FooterTemplate>
    </asp:Repeater>

public decimal BilingCount = 0;
    protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
    {
        if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
        {
            BilingCount += Convert.ToDecimal(DataBinder.Eval(e.Item.DataItem, "BilingCount").ToString().Trim());
        }
    }