File corrupted using multiple upload

[jing]

I got this problem when I tried to upload 2 or more file at 1 time. The uploaded files are corrupted. But if upload just 1 file, the uploaded file will be ok. The files were saved in the session so that can be validate at the next page and then save to a document library. I'm using 2009.3.1314.20 version

Here some of the code:
1st Page
aspx:

<telerik:RadUpload ID="Upload1" runat="server" MaxFileInputsCount="5" Width="600px" InitialFileInputsCount="1" ControlObjectsVisibility="RemoveButtons, AddButton" />
<asp:Button ID="Button1" runat="server" Text="OK" OnClick="Button1_Click" />

Codebehind:

private void SaveFilesToSession()
{
    IList list = new List<UploadedFileInfo>();
    foreach (UploadedFile uploadedFile in UploadDocument.UploadedFiles)
    {
        int fileLength = uploadedFile.ContentLength;
        byte[] buffer = new byte[fileLength];
        uploadedFile.InputStream.Read(buffer, 0, fileLength);

        UploadedFileInfo info = new UploadedFileInfo();
        info.Name = uploadedFile.GetName().Trim();
        info.FileInByte = buffer;
        info.ContentLength = uploadedFile.ContentLength;
        list.Add(info);
    }

    Session["UploadedFiles"] = list;
}

protected void ButtonSubmit_Click(object sender, EventArgs e)
{
    SaveFilesToSession();
    Response.Redirect("Upload2.aspx");
}

Thanks in advanced.

[jing]

I got it work by saving the file (byte[]) in session in Page_Load then proceed to do the serverside validation and redirect to another page.