State Management

Re: cannot maintain values of the file upload control after post back

ronald_yoh — Wed, 30 Sep 2009 04:53:33 GMT

it is not working with user control... can you help me out?

Re: cannot maintain values of the file upload control after post back

mbm2006 — Wed, 30 Jan 2008 09:42:34 GMT

what if i what to save that file using SaveAs....

pls reply...

Re: cannot maintain values of the file upload control after post back

ameydesai — Fri, 26 Oct 2007 03:57:01 GMT

Thanks alot for the help.

Regards.

Re: cannot maintain values of the file upload control after post back

anas — Wed, 24 Oct 2007 14:45:46 GMT

there is no direct solutions as mentioned .. until you use the ajax ..

also you cant set the value of FileUpload control even from javascript

and the following didnt worked even its rendered in html :

Me.FileUpload1.Attributes("value") ="...."

solution:

but you can use:

label control to display the last selected file .
hiddenField Control to transfer the selected file from the client to server.

but you need also to remeber the last posted file

because in case you dont select a file from FileUpload control after a postback and then submit ,

the FileUpload.postedFile data will gone , so you have to save the posted file to the session ...

this is how :

asp.net page Code:

 <form id="form1" runat="server">
         
        <asp:FileUpload ID="FileUpload1" runat="server" /> <br />
         <asp:Label ID="lblCurrentFile" runat="server"></asp:Label><br />
        <br />
        <asp:Button ID="BtnSubmit" runat="server" Text="postBack" />
        <br />
        <asp:HiddenField ID="HiddenField1" runat="server" />
    </form>

codeBehind:

Private Property PostedFile() As HttpPostedFile
        Get
            If Me.Session("postedFile") IsNot Nothing Then
                Return Session("postedFile")
            End If
            Return Nothing
        End Get
        Set(ByVal value As HttpPostedFile)
            Session("postedFile") = value
        End Set
    End Property

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        If Not IsPostBack Then
            Me.BtnSubmit.Attributes("onclick") = _
            String.Format("document.getElementById('{0}').value= document.getElementById('{1}').value;", _
            Me.HiddenField1.ClientID, Me.FileUpload1.ClientID)
        End If


        If Me.FileUpload1.PostedFile IsNot Nothing _
        AndAlso Me.FileUpload1.PostedFile.ContentLength > 0 Then
            Me.PostedFile = Me.FileUpload1.PostedFile
        End If

        If Me.HiddenField1.Value <> "" Then
            Me.lblCurrentFile.Text = Me.HiddenField1.Value
        End If

    End Sub

regards,

Re: cannot maintain values of the file upload control after post back

mustakim — Wed, 24 Oct 2007 13:42:21 GMT

HI,

we can't set value of file upload control after postback with codebehind and javascript. there is no such property to bind file upload control after postback.

Regards

Re: cannot maintain values of the file upload control after post back

pradeep7n — Wed, 24 Oct 2007 12:55:38 GMT

It is not possible to maintain values of the file upload control after post back.

And even its not possible to rebind the value for codebehind on pageload.

cannot maintain values of the file upload control after post back

ameydesai — Wed, 24 Oct 2007 09:01:56 GMT

I have a user control and have 2 drop downs in it... when i select one of it ....on the indexchange of the first dropdown i populate the other drop down...and on the post back the file path tat i have selected disappears after post back..