这页面是继承母版页的，里面有个FileUpload控件，小弟我想在后台（FileName）取到它的值为什么是空的，用JS取也是空的

这页面是继承母版页的，里面有个FileUpload控件，我想在后台（FileName）取到它的值为什么是空的，用JS取也是空的？

<%@ Page Title="" Language="C#" MasterPageFile="~/Admin/Master/MasterPage.master"
    AutoEventWireup="true" CodeFile="StaffAdd.aspx.cs" Inherits="Admin_jcgl_StaffAdd" %>

<%@ MasterType VirtualPath="~/Master/MasterPage.master" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
    <style type="text/css">
        .style1
        {
            height: 30px;
        }
    </style>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder0" runat="server">
</asp:Content>
<asp:Content ID="Content3" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
    <table class="Border" onkeydown="if(event.keyCode==13){event.keyCode=9;}">

        <tr id="trZp" runat="server" visible="true">
            <td class="TdRightTitle">
                照片
            </td>
            <td class="TdLeftTitle" colspan="3">
                <span class="lbl_Red">说明：照片格式必须为：jpg；高宽比建议为：3:2；大小不得超过200KB。</span><br />

                <asp:FileUpload ID="fuPic" runat="server" Width="65%" CssClass="txt_normal" />

                <asp:Button ID="btnFile" runat="server" CssClass="txt_normal" Style="text-align: center"
                    Text="上传照片" OnClientClick="return Imgshow();" OnClick="btnFile_Click" />
            </td>
        </tr>
        <tr>
            <td class="TdRightTitle">
                从业资格
            </td>
            <td class="TdLeftTitle" colspan="4">
                <asp:TextBox ID="tbxCyzg" runat="server" Text="" Width="75%" Height="100px" MaxLength="500"
                    CssClass="txt_normal" TextMode="MultiLine"></asp:TextBox>
            </td>
        </tr>
        <tr>
            <td width="*" colspan="5">
                <asp:Button ID="btnSave" runat="server" Text="保　存" CssClass="btn80" Enabled="false"
                    OnClick="btnSave_Click1" />
                <asp:Button ID="btnDelete" runat="server" Text="删　除" CssClass="btn80" Enabled="false"
                    OnClientClick="return confirm('您确认要删除该职员信息吗？')" OnClick="btnDelete_Click" />
                <asp:Button ID="btnClose" runat="server" Text="关　闭" CssClass="btn80" OnClientClick="parent.parent.GB_hide();" />
            </td>
        </tr>
    </table>
    <div class="divHidden">
        <asp:Button ID="btnVoid" runat="server" Height="0px" Text="sssss" Width="33px" OnClick="btnVoid_Click" />
        <asp:Button ID="btnClear" runat="server" Text="" Height="21px" OnClick="btnClear_Click" />
    </div>
    <asp:UpdateProgress ID="UpdateProgress1" runat="server" DisplayAfter="1000">
        <ProgressTemplate>

这页面是继承母版页的，里面有个FileUpload控件，小弟我想在后台（FileName）取到它的值为什么是空的，用JS取也是空的

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