File Upload Control not working

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Hi All,

I am using master page. In master page i have one Update panel.

In my Asp page i use another update panel. in that i am using Fileupload control.

But while running i cant access the file upload control .
it throw error message as Object Reference not set to instance of an object.

Please help me to solve this problem.

Thanks
Mohan

sample code is below

XML

in master page

<div id="content" class="shell">
        <asp:UpdatePanel ID="UpdatePanel1" runat="server">
            <ContentTemplate>
                <asp:ContentPlaceHolder id="ContentPlaceHolder1" runat="server">

                </asp:ContentPlaceHolder>
            </ContentTemplate>
        </asp:UpdatePanel>
    </div>

in Aspx page :


<asp:Content ID="Content3" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">

   <asp:UpdatePanel ID="RegUpdatePanel" runat="server">
                         <ContentTemplate>

  <asp:FileUpload ID="flUpload" runat="server" Width="148px" />
   <asp:Button ID="btSubmit" Text="Upload"  runat="server" OnClick="btn_UploadClick"  />

</ContentTemplate>
                         <Triggers>
                             <asp:PostBackTrigger ControlID="lnkTemplate" />
                             <asp:AsyncPostBackTrigger ControlID="btSubmit" />
                         </Triggers>
                     </asp:UpdatePanel>

Posted 23-Apr-13 20:32pm

Mohan_V

Updated 23-Apr-13 21:04pm

v2

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Comments

PrashantSonewane 24-Apr-13 2:38am

can you add the code which you have tried and erroring out?

Mohan_V 24-Apr-13 3:05am

Hi Prashant

I updated the question with code. please check and help me

Thanks
Mohan

V Mohan 24-Apr-13 2:55am

in master page

<div id="content" class="shell">
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<contenttemplate>
<asp:ContentPlaceHolder id="ContentPlaceHolder1" runat="server">

</div>

in Aspx page :

<asp:Content ID="Content3" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">

<asp:UpdatePanel ID="RegUpdatePanel" runat="server">
<contenttemplate>

<asp:FileUpload ID="flUpload" runat="server" Width="148px" />
<asp:Button ID="btSubmit" Text="Upload" runat="server" OnClick="btn_UploadClick" />

<Triggers>
<asp:PostBackTrigger ControlID="lnkTemplate" />
<asp:AsyncPostBackTrigger ControlID="btSubmit" />
</Triggers>

2 solutions

Solution 2

Form must be encoded with multipart/form-data if we want to upload the file using fileupload which is there in updatepanel. Change encoded attribute of form with following code in page_load event of page.

C#

Page.Form.Attributes.Add("enctype", "multipart/form-data");

--Amit

Posted 23-Apr-13 21:20pm

_Amy

Comments

Mohan_V 24-Apr-13 3:26am

Thanks Amit.

I added the line.But i cant run the application. it shows error as Element not found.

Please help

_Amy 24-Apr-13 3:29am

Check http://blog.anofsinger.com/2007/10/file-upload-not-working-on-first.html[^].

_Amy 24-Apr-13 3:31am

Or try this:
<form id="form1" runat="server" enctype="multipart/form-data">

Mohan_V 24-Apr-13 4:23am

Hi Amy

i add this code in my form but i am getting same problem.

Please help

Member 12386806 29-Mar-16 6:20am

if(!isPostBack)
{
Page.Form.Attributes.Add("enctype", "multipart/form-data");
}

add this code in page load

tzbbl 4-May-17 12:31pm

Great, bu adding the code in Page load, it works!

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V Mohan · Accepted Answer · 2013-04-23T20:55:00

XML

in master page

<div id="content" class="shell">
        <asp:UpdatePanel ID="UpdatePanel1" runat="server">
            <ContentTemplate>
                <asp:ContentPlaceHolder id="ContentPlaceHolder1" runat="server">

                </asp:ContentPlaceHolder>
            </ContentTemplate>
        </asp:UpdatePanel>
    </div>

in Aspx page :


<asp:Content ID="Content3" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">

   <asp:UpdatePanel ID="RegUpdatePanel" runat="server">
                         <ContentTemplate>

  <asp:FileUpload ID="flUpload" runat="server" Width="148px" />
   <asp:Button ID="btSubmit" Text="Upload"  runat="server" OnClick="btn_UploadClick"  />

</ContentTemplate>
                         <Triggers>
                             <asp:PostBackTrigger ControlID="lnkTemplate" />
                             <asp:AsyncPostBackTrigger ControlID="btSubmit" />
                         </Triggers>
                     </asp:UpdatePanel>