上传按钮没有上传图像文件ASP.NET C＃

Question

trySplit

以上是我的网页表单的代码。此webform页面继承了我的母版页，其中包含另一个表单标记。 我在页面中弹出窗口以提示用户更新他们的数据。

<div style="width: 90%; margin-right: 5%; margin-left: 5%; text-align:center">
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
    <asp:GridView ID="GridView4" runat="server" AutoGenerateColumns="False"
        DataKeyNames="immersionID" GridLines="Horizontal" 
        OnRowCommand="GridView4Data_RowCommand" onpageindexchanging="GridView4_PageIndexChanging" AllowPaging="true">
        <Columns>
            <asp:ButtonField CommandName="editRecord" ControlStyle-CssClass="btn"
                  ButtonType="Button" Text="Edit" HeaderText="Edit Record">
                 <ControlStyle CssClass="btn"></ControlStyle>
            </asp:ButtonField>
            <asp:BoundField DataField="immersionID" HeaderText="Immersion ID" 
                SortExpression="immersionID" />
            <asp:BoundField DataField="immersionName" HeaderText="Immersion Name" 
                SortExpression="immersionName" />
            <asp:BoundField DataField="startDate" HeaderText="Start Date" 
                SortExpression="startDate" />
            <asp:BoundField DataField="endDate" HeaderText="End Date " />
            <asp:BoundField DataField="noOfParticipants" HeaderText="No Of Participants" />
            <asp:BoundField DataField="FName" HeaderText="File Name" />
            <asp:TemplateField HeaderText="Download Link" 
                ItemStyle-HorizontalAlign="Center">
                <ItemTemplate>
                    <asp:LinkButton ID="lnkDownload2" runat="server" 
                        CommandArgument='<%# Eval("immersionID") %>' OnClick="DownloadFile4" 
                        Text="Download"></asp:LinkButton>
                </ItemTemplate>
                <ItemStyle HorizontalAlign="Center" />
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Image1" ItemStyle-Height="150" 
                ItemStyle-Width="170">
                <EditItemTemplate>
                    <asp:TextBox ID="TextBox12" runat="server" Text='<%# Eval("ITimage") %>'></asp:TextBox>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Image ID="Image10" runat="server" 
                        ImageUrl='<%# Eval("ITimage", GetUrl("{0}")) %>' />
                </ItemTemplate>
                <ControlStyle Height="170px" Width="150px" />
                <ItemStyle Height="170px" Width="150px" />
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Image2">
                <EditItemTemplate>
                    <asp:TextBox ID="TextBox13" runat="server" Text='<%# Eval("ITimage2") %>'></asp:TextBox>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Image ID="Image11" runat="server" 
                        ImageUrl='<%# Eval("ITimage2", GetUrl("{0}")) %>' />
                </ItemTemplate>
                <ControlStyle Height="170px" Width="150px" />
                <ItemStyle Height="170px" Width="150px" />
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Image3">
                <EditItemTemplate>
                    <asp:TextBox ID="TextBox14" runat="server" Text='<%# Eval("ITimage3") %>'></asp:TextBox>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Image ID="Image12" runat="server" 
                        ImageUrl='<%# Eval("ITimage3", GetUrl("{0}")) %>' />
                </ItemTemplate>
                <ControlStyle Height="170px" Width="150px" />
                <ItemStyle Height="170px" Width="150px" />
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Image4" SortExpression="ITimage4">
                <EditItemTemplate>
                    <asp:TextBox ID="TextBox3" runat="server" Text='<%# Eval("ITimage4") %>'></asp:TextBox>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Image ID="Image3" runat="server" ImageUrl='<%# Eval("ITimage4", GetUrl("{0}")) %>' />
                </ItemTemplate>
                <ControlStyle Height="170px" Width="150px" />
                <ItemStyle Height="170px" Width="150px" />
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Image5" SortExpression="ITimage5">
                <EditItemTemplate>
                    <asp:TextBox ID="TextBox2" runat="server" Text='<%# Eval("ITimage5") %>'></asp:TextBox>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Image ID="Image2" runat="server" ImageUrl='<%# Eval("ITimage5", GetUrl("{0}")) %>' />
                </ItemTemplate>
                <ControlStyle Height="170px" Width="150px" />
                <ItemStyle Height="170px" Width="150px" />
            </asp:TemplateField>
        </Columns>
        <PagerStyle BackColor="White" ForeColor="Black" HorizontalAlign="Right" />
        <EmptyDataTemplate>
            <asp:Label ID="Label29" runat="server" ForeColor="Red" Text="No Record Found"></asp:Label>
        </EmptyDataTemplate>
        <SelectedRowStyle BackColor="#FFFFCC" Font-Bold="True" ForeColor="Black" />
        <HeaderStyle BackColor="#333333" Font-Bold="True" ForeColor="White" />
        <AlternatingRowStyle BackColor="White" ForeColor="#000000" />
    </asp:GridView>
</ContentTemplate>    
</asp:UpdatePanel> 

<div id="editModal" class="modal hide fade" tabindex="-1" role="dialog" aria-labelledby="editModalLabel" aria-hidden="true">
          <asp:UpdatePanel ID="UpdatePanel2" runat="server">
                <ContentTemplate>

                 <table width="100%" style="width: 100%; height: 100%;" cellpadding="0" cellspacing="5">
            <tr>
                <td colspan="2" style="color:Black;"
                    align="center">

                        <div class="modal-header">
                        <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
                    <h3>Details</h3> 
                </div>
                </td>
            </tr>
            <tr>
                <td colspan="2" style="width: 45%; text-align: center;">
                    <asp:Label ID="LabelValidate" runat="server" />
                </td>
            </tr>
            <tr>
                <td align="right" style="width: 45%">
                    Immersion ID:
                </td>
                <td>
                    <asp:Label ID="lblID" runat="server"></asp:Label>
                </td>
            </tr>
            <tr>
                <td align="right" style="width: 45%">
                    Immersion Name:
                </td>
                <td>
                    <asp:TextBox ID="TBName" runat="server" />
                </td>
            </tr>
            <tr>
                <td align="right">
                    Immersion Description:
                </td>
                <td>
                    <asp:TextBox ID="TBDesc" runat="server" TextMode="MultiLine"/>
                </td>
            </tr>
            <tr>
                <td align="right">
                    Immersion Location:
                </td>
                <td>
                    <asp:TextBox ID="TBLocation" runat="server" />
                </td>
            </tr>
            <tr>
                <td align="right">
                    Immersion Country:
                </td>
                <td>
                    <asp:TextBox ID="TBCountry" runat="server" />
                </td>
            </tr>
            <tr>
                <td align="right">
                    Category:
                </td>
                <td>
                    <asp:DropDownList ID="TBCat" runat="server">
                        <asp:ListItem>Select a Category</asp:ListItem>
                        <asp:ListItem>Category A</asp:ListItem>
                        <asp:ListItem>Category B</asp:ListItem>
                    </asp:DropDownList>
                </td>
            </tr>
            <tr>
                <td align="right">
                    No. Of Participants:
                </td>
                <td>
                    <asp:TextBox ID="TBNumber" runat="server" />

                </td>
            </tr>
            <tr>
                <td align="right">
                    Start Date:
                </td>
                <td>
                    <asp:TextBox ID="TBStart" runat="server" type="date"/>
                </td>
            </tr>
            <tr>
                <td align="right">
                    End Date:
                </td>
                <td>
                    <asp:TextBox ID="TBEnd" runat="server" type="date"/>
                </td>
            </tr>
            <tr>
                <td align="right">
                    Remarks:
                </td>
                <td>
                    <asp:TextBox ID="TBRemarks" runat="server" TextMode="MultiLine"/>
                </td>
            </tr>
            <tr>
                <td align="right">
                    Submitted By:
                </td>
                <td>
                    <asp:Label ID="TBSubmit" runat="server"></asp:Label>
                </td>
            </tr>
            <tr>
                <td align="right">
                    Diploma:
                </td>
                <td>
                    <asp:TextBox ID="TBDip" runat="server" />
                </td>
            </tr>
            <tr>
                <td class="style10">
                    Attachment:</td>
                <td class="style11">
                    <asp:FileUpload ID="FileUpload19" runat="server" AllowMultiple="true"/>
                </td>
            </tr>
            <tr>
                <td class="style10">
                    Image 1: </td>
                <td class="style11">
                    <asp:FileUpload ID="FileUpload20" runat="server" />
                </td>
            </tr>
            <tr>
                <td class="style10">
                    Image 2: </td>
                <td class="style11">
                    <asp:FileUpload ID="FileUpload21" runat="server" />
                </td>
            </tr>
            <tr>
                <td class="style10">
                    Image 3: </td>
                <td class="style11">
                    <asp:FileUpload ID="FileUpload22" runat="server" />
                </td>
            </tr>
            <tr>
                <td class="style10">
                    Image 4: </td>
                <td class="style11">
                    <asp:FileUpload ID="FileUpload23" runat="server" />
                </td>
            </tr>
            <tr>
                <td class="style10">
                    Image 5: </td>
                <td class="style11">
                    <asp:FileUpload ID="FileUpload24" runat="server" />
                </td>
            </tr>
          </table>

                 <div class="modal-footer">
                        <asp:Label ID="Label1" Visible="false" runat="server"></asp:Label>
                        <asp:Button ID="btnUpdate" class="btn" CommandName="Update" runat="server" Text="Update" OnClick="btnUpdate_Click" />
                        <button class="btn" data-dismiss="modal" aria-hidden="true">Close</button>
                    </div>
            </ContentTemplate>
                 <Triggers>
                    <asp:AsyncPostBackTrigger ControlID="GridView4" EventName="RowCommand" />
                    <asp:AsyncPostBackTrigger ControlID="btnUpdate" EventName="Click" />
                </Triggers>
          </asp:UpdatePanel>
   </div>

</div>

上面是我将代码上传到我的数据库的代码隐藏。

*所有其他字段都可以更新，例如日期和事件名称等

单击上传按钮时没有任何错误，我已经尝试过调试它，显然它会跳过所有上传方法，即使我在每个字段中选择了一个文件。

所以问题是我无法将图像上传到数据库中。请帮忙解决这个问题，非常感谢帮助。谢谢！