How Do I Get Uploaded File On Server Side When Control Is Placed Inside Modalpopupextender

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C#

ASP.NET

file

I am using ajax ModalPopupExtender to allow users to enter data. Along with data, users are required to upload file size 512. Control in form are input type text, asp:button and asp:FileUpload.Every control are working fine. My problem is on click on button for file upload, fileUpload.HasFile always shows false even when file is attached. I have attached code here.

<div style="width: 180px; float: right;">
                                        <asp:FileUpload ID="fileUpload" runat="server" />
                                        &nbsp;&nbsp;

                                        <asp:Button id="btnUpload" runat="server" Text="Upload" OnClick="btnUpload_Click"  CssClass="button"/>
                                    </div>

<pre lang="cs">protected void btnUpload_Click(object sender, EventArgs e)
        {
            if (fileUpload.HasFile)
            {
            }
        }</pre>

I do not have idea of what's going on, Every time i click on Upload after selecting file, fileUpload.HasFile is always returning false. However, if i place this code outside modalpopupextender, fileupload is returning value true on file upload. Any help??