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Editorial Team
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Asked: 2026-05-24T15:45:45+00:00

<asp:FileUpload runat=server ID=uploadCertification /> <asp:Button runat=server ID=btntext OnClick=btntext_Click /> Code uploadCertification.PostedFile.SaveAs(serverPathImage + \\CertificationCompany\\as.td); this

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<asp:FileUpload runat="server" ID="uploadCertification" />
<asp:Button runat="server" ID="btntext" OnClick="btntext_Click" />

Code

uploadCertification.PostedFile.SaveAs(serverPathImage + "\\CertificationCompany\\as.td");

this code work fine but when

 <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
      <asp:UpdatePanel ID="UpdatePanel3" runat="server"><ContentTemplate>
     <asp:FileUpload runat="server" ID="uploadCertification" />
      <asp:Button runat="server" ID="btntext" OnClick="btntext_Click" />
</ContentTemplate></asp:UpdatePanel>

Code

 uploadCertification.PostedFile.SaveAs(serverPathImage + "\\CertificationCompany\\as.td");

this line say error: Object reference not set to an instance of an object.

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1 Answer

  1. Editorial Team

    Take a look at using a PostBackTrigger within your UpdatePanel:

    PostBackTrigger

    The above MSDN article contains a code listing for using a PostBackTrigger with a FileUpload control.

    Other approaches available to you are to use the iframe approach (mentioned in one of the other answers) or to use one of the many third party components out there which make use of javascript and flash to upload files (Find links to a couple of the more popular ones below)

    Uploadify

    SWFUpload

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