Allow Postback for a Specific Panel HTML, ASP.NET

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I am trying to upload some files and send as an email. I have two update panels because, when I click the Menu item, it automatically refreshes the whole page and hence no file will be attached. How do I stop it?
I want my page to hold the files until I click Button3. Then it can perform the function of sending the email.
Attached is my code

ASP.NET

<%@ Page Title="Home Page" Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="EDMSProject._Default" %>


<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title></title>
    <style type="text/css">
        .auto-style2 {
            width: 186px;
        }
    </style>
    </head>
<body>
<form id="form1" runat="server">   
    <asp:Label ID="Label1" runat="server" Text="Label">
    <br />
        
    <br />
    
    <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Check DocuTray " />
    <asp:ScriptManager ID="ScriptManager1" runat="server" />
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
       <contenttemplate>
    <asp:FileUpload ID="FileUpload1" runat="server" AllowMultiple="True" />
    <br />
            </contenttemplate>
        <triggers>
        <asp:PostBackTrigger ControlID = "Button3"/>     
    </triggers>
    

         <asp:UpdatePanel ID="UpdatePanel2" runat="server">
       <contenttemplate>
    
        <asp:Button ID="Button2" runat="server" Text="Check History/Status" />
       
       
             <asp:Menu ID="Menu1" runat="server" OnMenuItemClick="Menu1_MenuItemClick" Orientation="Horizontal" style="margin-left: 41px">
                 <items>
                     <asp:MenuItem Text="Action" Value="Action">
                         <asp:MenuItem Text="Forward" Value="Forward">
                         <asp:MenuItem Text="Save" Value="Save">
                         <asp:MenuItem Text="Close Ticket" Value="Close Ticket">
                     
                 </items>
                 <staticitemtemplate>
                     <%# Eval("Text") %>
                 </staticitemtemplate>
              
                
              <asp:Label ID="Label2" runat="server" Text="Department">
              <asp:DropDownList ID="DropDownList1" runat="server" DataTextField="Department" DataValueField="Department" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
              
              <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:EDMSConnectionString %>" SelectCommand="SELECT * FROM [Employee]">
       <br />
              <asp:Label ID="Label3" runat="server" Text="Client">
       <asp:DropDownList ID="DropDownList2" runat="server">
           <asp:ListItem>Pavis
           <asp:ListItem>Dove Associates
              
        <br />
       <asp:Label ID="Label4" runat="server" Text="Recipient">
       <asp:DropDownList ID="DropDownList3" runat="server">
              <asp:ListBox ID="ListBox1" runat="server" SelectionMode="Multiple">
       <br />
       <asp:Label ID="Label6" runat="server" Text="Subject">
       <asp:TextBox ID="TextBox2" runat="server" Width="182px">
        <br />
       <asp:Label ID="Label5" runat="server" Text="Message">
       <asp:TextBox ID="TextBox1" runat="server" Height="109px" Width="265px">
       <br />
       <asp:Button ID="Button3" runat="server" Text="Button" OnClick="Button3_Click" style="margin-left: 260px" />
             </contenttemplate> 
                  
            
      
</form>     
    </body>
</html>

Department

Posted 18-Mar-14 23:13pm

boyfunky

Updated 26-Apr-14 10:13am

Manas Bhardwaj

v3

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Comments

ZurdoDev 26-Apr-14 21:27pm

The client can't hold on to the files, at least not with the fileupload control. Once the user picks the file it automatically posts back.

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sankarsan parida · Answer 1 · 2014-04-26T16:44:00

See your button3 need to be placed inside updatepanel1. If you are using for fileupload

 <asp:updatepanel id="UpdatePanel1" runat="server" xmlns:asp="#unknown">
       <contenttemplate>
    <asp:fileupload id="FileUpload1" runat="server" allowmultiple="True" />
    <br />
 <asp:button id="Button3" runat="server" text="Button" onclick="Button3_Click" style="margin-left: 260px" />

            </contenttemplate>
        <triggers>
        <asp:postbacktrigger controlid="Button3" />     
    </triggers>

</asp:updatepanel>

Or you can use whole of the page in a single updatepanel
for more information see this article
Using-FileUpload-Control-inside-ASP.Net-AJAX-UpdatePanel-Control.aspx[^]