File Upload is not working - asp.net

Question

I'm using file upload in my site. I'm uploading word Document(Doc,Docx). Suddenly, it's not working. It is not getting the filename. It is showing empty!!! My Code is as follows:
<asp:Content ID="Content1" runat="server" ContentPlaceHolderID="ContentPlaceHolder1">
<table width="100%" align="center">
<tr>
<td style="height: 21px" align="center">
<span class="lbl"></span>
<asp:UpdatePanel ID="UpdatePanel2" runat="server">
<ContentTemplate>
<asp:Button ID="btnResumedload" Text="Download Resume" runat="server" BackColor="Maroon"
ForeColor="White" Font-Bold="true" OnClick="btnResumedload_Click" Height="27px"
Width="195px" />
</ContentTemplate>
</asp:UpdatePanel>
</td>
</tr>
<tr>
<td align="center">
<asp:UpdatePanel ID="UpdatePanel4" runat="server">
<ContentTemplate>
<asp:Button ID="btnUploadnew" Text="Upload New" runat="server" BackColor="Maroon"
ForeColor="White" Font-Bold="true" OnClick="btnUploadnew_Click" Height="30px"
Width="198px" />
</ContentTemplate>
</asp:UpdatePanel>
</td>
</tr>
<tr>
<td align="center">
<asp:UpdatePanel ID="UpdatePanel3" runat="server">
<ContentTemplate>
<asp:Button ID="btnDel" Height="30px" Width="198px" OnClientClick="return confirm('Are you sure?');"
BackColor="Maroon" ForeColor="White" Font-Bold="true" Text="Delete Resume" runat="server"
OnClick="btnDel_Click"></asp:Button>
</ContentTemplate>
</asp:UpdatePanel>
</td>
</tr>
<tr>
<td align="center">
<asp:Label ID="lblmsg" runat="server" Font-Bold="True" ForeColor="Red" Visible="False"
Height="17px" Width="855px"></asp:Label>
</td>
</tr>
<tr>
<td align="center">
<span class="txt">
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<%--<ajaxToolkit:AsyncFileUpload ID="fpResumenew" runat="server" Visible="false" />--%>
<asp:FileUpload ID="fpResumenew" runat="server" Visible="false" Width="226px" />
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="btnUpload" />
</Triggers>
</asp:UpdatePanel>
</span>
</td>
</tr>
<tr>
<td align="center">
</td>
</tr>
<tr>
<td style="vertical-align: top" align="center">
<%--<asp:Button ID="btnUpload" Font-Bold="true" DisabledText="Processing..." Visible="false"
Text="Upload" BackColor="Maroon" ForeColor="White" runat="server" OnClick="btnUpload_Click" />--%>
<cc1:ClickOnceButton ID="btnUpload" Font-Bold="true" DisabledText="Processing..."
Visible="false" Text="Upload" BackColor="Maroon" ForeColor="White" runat="server"
OnClick="btnUpload_Click" DisableAfterClick="True" />
</td>
</tr>
</table>
protected void btn_Click(object sender, EventArgs e)
{
string strfilename = fp.FileName.ToString();
if (fp.PostedFile.FileName.Trim().Length != 0)
{
binary = new byte[fp.PostedFile.ContentLength];
binary = fp.FileBytes;
doc = fp.FileName;
contenttype = fp.PostedFile.ContentType;
}
}
Just a sample!!!
Nothing works for me.. Problem is that I'm using three more buttons in the same page. The other buttons initializing the file upload control. So, when clicking the upload button, the file name is empty. So, I used another page for uploading the word document. Now, it is working.. !! Anyhow, I need the solution for this!! Anyone give me idea!!

Answer 1

Hai vaishu
FileUpload controls are not compatible with UpdatePanel when they are used to upload files as part of an asynchronous postback.
Just check the AJAX documentation. The FileUpload control is not supported inside an UpdatePanel (http://ajax.asp.net/docs/overview/UpdatePanelOverview.aspx):
or
use asp:postbacktrigger instead of asyncpostbacktrigger
<asp:updatepanel runat="server" id="UpdatePanel1">
<contenttemplate>
<asp:FileUpload runat="server" id="FileUpload1" />
<asp:button runat="server" id="ButtonSubmit" text="Postback" />
</contenttemplate>
<triggers>
<asp:postbacktrigger controlid="ButtonSubmit" />
</triggers>
</asp:updatepanel>
or
use ajax for asynchronous file upload:
http://www.asp.net/(S(fu2l2uzphr2u3u45q2dnez55))/ajax/AjaxControlToolkit/Samples/AsyncFileUpload/AsyncFileUpload.aspx

Answer 2

The reason that the postback trigger is not working in your case is because the FileUpload Control is set to visible=false. If you use display:none instead, the postback trigger will work.

Answer 3

This works just fine, I finally solved the issue... the ButtonSubmit is reload by the trigger so the page got the info from the control.
<asp:updatepanel runat="server" id="UpdatePanel1">
<contenttemplate>
<asp:FileUpload runat="server" id="FileUpload1" />
<asp:button runat="server" id="ButtonSubmit" text="Postback" />
</contenttemplate>
<triggers>
<asp:postbacktrigger controlid="ButtonSubmit" />
</triggers>
</asp:updatepanel>