Repeater 和 GridView 中数据格式化

GridView中显示两位小数： 

<asp:BoundField DataField="investmoney" DataFormatString="{0:f2}" HeaderText="投资金额">
                            <HeaderStyle />
                            <ItemStyle HorizontalAlign="Center" />
                        </asp:BoundField>

显示短时间：

 <asp:BoundField DataField="lendtime" DataFormatString="{0:d}" HeaderText="回款日期">
                            <HeaderStyle />
                            <ItemStyle HorizontalAlign="Center" />
                        </asp:BoundField>

数据是后台方法计算出来的：

   <asp:TemplateField HeaderText="电话">
                            <EditItemTemplate>
                                <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("Mobile") %>'></asp:TextBox>
                            </EditItemTemplate>
                            <ItemTemplate>
                                <asp:Label ID="Label1" runat="server"
                                    Text='<%#GetPhone(Eval("Mobile").ToString(),Eval("Phone").ToString())%>'></asp:Label>
                            </ItemTemplate>
                            <ItemStyle HorizontalAlign="Center" />
                        </asp:TemplateField>

后台方法： /// <summary>
    /// 返回有效联系电话
    /// </summary>
    /// <param name="mobile">手机字符串</param>
    /// <param name="phone">电话字符串</param>
    /// <returns></returns>
     public static string GetPhone(string mobile, string phone)
    {

        if (mobile.Trim().Length > 0 && phone.Trim().Length > 0)
        {
            return mobile.Trim().ToString();
        }
        else if (mobile.Trim().Length > 0 && phone.Trim().Length <= 0)
        {
            return mobile.Trim().ToString();
        }
        else
        {

            return phone.Trim().ToString();
        }

    }

Repeater中：数据格式：

<td><asp:Label ID="lblBackDate" Text='<%# string.Format("{0:d}",Eval("BackDate")) %>' runat="server"></asp:Label></td>
    <td><asp:Label ID="lblYieldMoney" Text='<%# string.Format("{0:f2}",Eval("YieldMoney")) %>' runat="server"></asp:Label></td>