Try to use session variables :)
2009/7/15 mitdej <[email protected]>
>
> Hi,
> I'm building a user control with two buttons and a FileUpload control
> for oploading/downloading files.
> I've created 3 properties for keeping information about a file
> (content, name and mime type) as bindable properties.
> I'm calling explicit DataBind() in the Page_Load event of the hosting
> control of my user control.
> When the button is clicked, first the Page_Load event of the hosting
> page is fired, the binding is happening then the Page_Load event of
> the user control is fired. Until now everithing is OK.
> The problem is when event handler for the button click is executing.
> It seems like the execution of the event is running in a new object
> instance of the user control.
> This means that all the bound properties are lost.
> So the question is: Is there a way to forbid the creation of a new
> object of the user control.
>
> Here is the User control code:
> public partial class UpDownAttachment : System.Web.UI.UserControl
> {
> public event EventHandler NewFileUploaded;
>
> [Bindable(true)]
> public byte[] Content
> {
> get; set;
> }
> [Bindable(true)]
> public string MIMEType
> {
> get; set;
> }
> [Bindable(true)]
> public string FileName
> {
> get; set;
> }
>
>
> protected void Page_Load(object sender, EventArgs e)
> {
> }
>
>
> protected void btnUploadAttachment_Click(object sender,
> EventArgs e)
> {
> if(fuUploadAttachment.HasFile)
> {
> try
> {
> Content = fuUploadAttachment.FileBytes;
> MIMEType =
> fuUploadAttachment.PostedFile.ContentType;
> FileName = fuUploadAttachment.FileName;
> StatusLabel.Text = "Upload status: File
> uploaded!";
> if (NewFileUploaded != null)
> NewFileUploaded.Invoke(this, new EventArgs
> ());
> }
> catch(Exception ex)
> {
> StatusLabel.Text = "Upload status: The file could
> not be uploaded. The following error occured: " + ex.Message;
> }
> }
> }
>
>
> protected void btnDownloadAttachment_Click(object sender,
> EventArgs e)
> {
> if (Content!=null&&Content.Count() > 0)
> {
> Response.AppendHeader("Content-disposition",
> "attachment; filename=" + FileName);
> Response.ContentType = MIMEType;
> Response.BinaryWrite(Content);
> }
>
>
> }
> }
>
>
> And parts of the host page:
>
>
> <%@ Register TagPrefix="uc1" TagName="download" Src="~/
> CustomControls/
> UpDownAttachment.ascx" %>
> .....
> <asp:FormView ID="EditFormView" runat="server" DefaultMode= "Insert"
> DataSourceID="ProjectAttDataSource"
> oniteminserting="EditFormView_ItemInserting"
> DataKeyNames="ID"
> onitemupdating="EditFormView_ItemUpdating" BackColor="#284775"
> ForeColor="WhiteSmoke" >
> .......
> <uc1:download ID="udaAttachment" runat="server" Content='<%# Eval
> ("Attachment") %>' MIMEType='<%# Eval("MIME_Type") %>' FileName='<%#
> Eval("Title") %>' OnNewFileUploaded="udaAttachment_NewFileUploaded" /
> >
>
>
>
>
> Thanks in advance,
> mitdej
>
