How to save a file from HTML File Control in AJAX Section Using ASP.Net with C#

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  •     AJAX stands for Asynchronous  Java script and XML  
  •    AJAX enable a page asynchronously post back a page.  
  •   Only required part load from server instead of entire page so its   increase web performance.
  • Some control which are design for post back like file browser which can’t load a file if its not post back so you can’t upload a file when it’s in AJAX section.
    
    
      For upload a file in AJAX section using file browser you need to register a button for post back if user will click on than button then all page will be reloaded.
    
    <asp:UpdatePanel ID="U1" runat="server">
              <ContentTemplate>
    ....................................

    ....................................

             </ContentTemplate>
       <Triggers> 
           <asp:PostBackTrigger ControlID="saveButton">
       </Triggers>  
    </asp:UpdatePanel> 
    Here is your html code i leave ...... for your content Savebutton is a which post back entire page
    So i registered this button in trigger section post backTrigger register control which have to post back.....Save Button Code
                                                                               
    if (FileUpload1.HasFile)

    {

    string s = "~/Photo/Student/" +  FileUpload1.FileName;                          

        FileUpload1.SaveAs(MapPath(s));

       

    }