Issue in fiel upload control

Question

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ASP.NET

<asp:FileUpload ID="FileUpload1" runat="server" />

C#

if (FileUpload1.HasFile)
 {
     string FileName = Path.GetFileName(FileUpload1.PostedFile.FileName);
     mail.Attachments.Add(new Attachment(FileUpload1.PostedFile.InputStream, FileName));
 }

Issue:

Fileupload contains null value even after selecting a file using fileupload control.

Posted 8-Jan-14 1:02am

riodejenris14

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Comments

Sibasisjena 8-Jan-14 7:13am

Please put a debugger in the if condition and upload one file again and check the the control is going inside the if block or not.

riodejenris14 8-Jan-14 7:21am

thanx bro for your comment

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TrushnaK · Accepted Answer · 2014-01-08T01:18:00

When a file is selected using FileUpload Control ,then on postback, PostedFile property gets initialized with HttpPostedFile object for the file. Since http request cannot maintain state, so it looses it's state.

use update panel before file upload control.
like:-

XML

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
      <ContentTemplate>
      <asp:FileUpload ID="fileUploadImage" runat="server"></asp:FileUpload>
      <asp:Button ID="btnUpload" runat="server" Text="Upload Image"
           OnClick="btnUpload_Click" />
      </ContentTemplate>
      <Triggers>
          <asp:PostBackTrigger ControlID="btnUpload"  />
      </Triggers>
 </asp:UpdatePanel>