Can't get AsyncFileUpload to work in update panel

Question

I have a user control with a updatepanel, script manager and a asyncfileupload control.

<%@ Register Assembly=\"AjaxControlToolkit\" Namespace=\"AjaxContr         


        

Answer 1

Make sure that the usercontrol with asyncfileupload control is not loaded asynchronously, for example via Response.Redirect("pageWithUploadControl").

Have you handled the FileUploadComplete Event and checked if AsyncFileUploadState is Success?

   Private Sub AsyncFileUpload1_UploadedComplete(ByVal sender As Object, ByVal e As AjaxControlToolkit.AsyncFileUploadEventArgs) Handles AsyncFileUpload1.UploadedComplete
        If e.state = AjaxControlToolkit.AsyncFileUploadState.Success Then
            '....'
        Else
            showErrorMessage(e)
        End If
    End Sub

    Private Sub showErrorMessage(ByVal e As AjaxControlToolkit.AsyncFileUploadEventArgs)
        Dim message As String = String.Empty
        Select Case e.statusMessage
            Case AjaxControlToolkit.AsyncFileUpload.Constants.Errors.EmptyContentLength
                message = "Empty content length!"
            Case AjaxControlToolkit.AsyncFileUpload.Constants.Errors.FileNull
                message = "Fill NULL!"
            Case AjaxControlToolkit.AsyncFileUpload.Constants.Errors.InputStreamNull
                message = "Input Stream NULL!"
            Case AjaxControlToolkit.AsyncFileUpload.Constants.Errors.NoFileName
                message = "No File Name!"
            Case AjaxControlToolkit.AsyncFileUpload.Constants.Errors.NoFiles
                message = "No Files!"
        End Select
        LblMessage.Text = message 
    End Sub

Try to change change the enctype of your form: