File Upload is not working

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">
            &nbsp;
        </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!!

---

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

---

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.

---

这工作得很好，我终于解决了问题... ButtonSubmit由触发器重新加载，因此页面从控件获取信息。

 <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>

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