How do I use the AjaxFileUpload control of AJAX?

set a script manager on your page and use this method on server side to save file!
SaveAs(string filename)
and this property for number of files for upload:
MaximumNumberOfFiles="10" this mean you can upload 10 file in max!
if your still you have problem , paste your code for more help!

download ajaxtoolkit May release (this feature has been released currently.)

Code Behind (VB)

Imports System.Data
Imports System.IO
Partial Class AjaxTest
    Inherits System.Web.UI.Page

   
    Protected Sub ajaxUpload1_OnUploadComplete(ByVal sender As Object, ByVal e As AjaxControlToolkit.AjaxFileUploadEventArgs)
        ' Generate file path
        Dim filePath As String = "~/Uploads/" & Convert.ToString(e.FileName)

        ' Save upload file to the file system
        ajaxUpload1.SaveAs(MapPath(filePath))
    End Sub
End Class

Asp.Net:
Add the assembly:

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>

And Ajax Control will be like:

<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
       </asp:ToolkitScriptManager>
   <asp:AjaxFileUpload
       id="ajaxUpload1"
       OnUploadComplete="ajaxUpload1_OnUploadComplete"
       ThrobberID="MyThrobber"
       runat="server"  />

       <asp:Image
           id="MyThrobber"
           ImageUrl="~/Images/indicator3.gif"
           Style="display:None"
           runat="server" />

Note: Create a folder in your solution explorer named Images and another as Uploads.

I had the same problem. To solve this you have add this handler in the

<httpHandlers>

of your web.config

<add verb="*" path="AjaxFileUploadHandler.axd" type="AjaxControlToolkit.AjaxFileUploadHandler, AjaxControlToolkit"/>

You can find more details here:

http://www.asp.net/AjaxLibrary/AjaxControlToolkitSampleSite/AjaxFileUpload/AjaxFileUpload.aspx[^]