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02.11.2008 at 05:04PM PST, ID: 23154909
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7.6

What can help AJAX handle simple file operation?

Asked by psmithphil in Programming for ASP.NET, Microsoft Visual Basic.Net

Tags: ,

I'm using asp.net & vb.net in Visual Studio 2005 & IE6.  I have a web application that uses the FileUpload component to choose a file on the hard disk, process the file, and then return a message in the Label to indicate that the process is done.  It works fine.  But I then made it an AJAX application in order to add a simple animation with the AJAX UpdateProgress control, and it failed.  It turns out there is a Microsoft bug where several components won't work with the AJAX component, and the FileUpload component turns out to be one of them.  VERY DISAPPOINTING.  What I'm trying to do is so simple and rudimentary, but AJAX cannot handle it.  Amazing.

My Web app merely uses the path & filename from the FileUpload control and puts it in a variable, but gives the "Object reference not set to an instance of an object" when I try to do that with AJAX:
Protected Sub btnProcess_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnProcess.Click
    strDownloadDumpFile = FileUpload1.PostedFile.FileName   'Full file and path.


So it begs the question - is there another component that will give a dialog box that will work with AJAX?  I'm including a Word doc that shows the problem, but the only thing I want to know is what WILL do the simple, basic operation I want?   Thank you.Start Free Trial
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Explanation of AJAX failure including pictures
 
[+][-]02.11.2008 at 05:17PM PST, ID: 20871885

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[+][-]02.11.2008 at 05:24PM PST, ID: 20871916

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[+][-]02.11.2008 at 05:28PM PST, ID: 20871928

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[+][-]02.11.2008 at 05:47PM PST, ID: 20871996

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Zones: Programming for ASP.NET, Microsoft Visual Basic.Net
Tags: Microsoft, Object reference not set to an instance of an object
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Solution Provided By: vs1784
Participating Experts: 2
Solution Grade: A
 
 
[+][-]02.11.2008 at 06:07PM PST, ID: 20872075

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[+][-]03.27.2008 at 04:14AM PDT, ID: 21220116

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[+][-]03.27.2008 at 12:02PM PDT, ID: 21224705

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