I used file upload control for uploading photo but its throwing error "object reference not set to an instance of an object" only in dnn 481,dnn 482 versions. I used same control in dnn 470 version there it works fine.

Hello Sir,

Please see the code below

I used btn as  asp button control,fu as asp file upload control,img as asp image control

I am getting error in  this line  " contLength = fu.PostedFile.ContentLength" as object refererence not set to an instance of an object.
I am able to get file upload control's ID but I am not able to  capturethe content of that upload control.

Pls give me a soln.

Protected Sub btn_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btn.Click
            Dim contLength As Integer
            contLength = fu.PostedFile.ContentLength
            Dim myData(contLength) As Byte
            fu.PostedFile.InputStream.Read(myData, 0, contLength)
            Dim strpath As String = "C:\Inetpub\wwwroot\iredver1.0\CompanyLogo"
            Dim strfileName As String = Path.GetFileName(fu.PostedFile.FileName)
            Dim strpth As String = ""
            strpth = Path.Combine(strpath, strfileName)
            fu.SaveAs(strpth)
            img.ImageUrl = strpth

  End Sub

 

If your module is wrapped in an AJAX UpdatePanel or has "Supports Partial Rendering" checked in the module's control definition, the FileUpload control will not be able to perform the upload as it requires a full postback. Without a full postback, the property fu.PostedFile would always be null.

If you want to use an AJAX UpdatePanel or "Supports Partial Rendering",  the button control which triggers the upload will need to be registered as a PostBackControl in the module control's Page_Init or Page_Load handler. As the following code will need to be called each time the page loads, do NOT place it within a If Not Page.IsPostback condition:

If DotNetNuke.Framework.AJAX.IsEnabled Then
      DotNetNuke.Framework.AJAX.RegisterPostBackControl(btn)
End If

As an aside, you might also like to check out my ImageEditorControl for DNN at www.codeplex/imageeditor as it provides file upload, image preview, and basic image editing including cropping and enhancement, auto-resizing and thumbnailing, and save to any of the DNN file storage systems.

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
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