Download feature not working within update panel in asp.net

Question

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In gridview There is an image button to download file. I have used the gridview with updatepanel.If I removed Updatepanel the download option will work fine.But i have to use Updatepanel in this.How can Isolve this?

XML

<asp:UpdatePanel ID="UpdatePanel2" runat="server" >
                       <ContentTemplate>
              <asp:GridView ID="GridImport" runat="server" AutoGenerateColumns="false" Width="99%" Height="50%"
                                   AllowPaging="true" GridLines="None" Style="padding: 15px; text-align: left; overflow: scroll;
                                   font-family: Arial; font-size: 11pt;" ShowHeaderWhenEmpty="true" PageSize="5"
                                   CssClass="Grid_LE" HeaderStyle-CssClass="Grid_Head" EmptyDataText = "No files Imported" OnPageIndexChanging="GridImport_PageIndexChanging">
               <Columns>
                   <asp:BoundField DataField="Text" HeaderText="File Name" />
                   <asp:TemplateField>
                       <ItemTemplate>
                             <asp:ImageButton ID="lnkDownload" runat="server" CommandArgument='<%# Eval("Value") %>'  Style="width: 20px; height: 20px;" ImageUrl="~/Images/download.png" OnClick = "DownloadFile"  />   <%--CommandName="Upload"  OnClick="DownloadFile"--%>
                       </ItemTemplate>
                   </asp:TemplateField>
                   <asp:TemplateField>
                       <ItemTemplate>
                             <asp:ImageButton ID="lnkDelete" runat="server" CommandArgument='<%# Eval("Value") %>'  Style="width: 20px; height: 20px;" ImageUrl="~/Images/cancel.png" OnClick="DeleteFile" />
                       </ItemTemplate>
                   </asp:TemplateField>
               </Columns>
           </asp:GridView>
          </ContentTemplate>
                   </asp:UpdatePanel>

C#

.cs

   protected void DownloadFile(object sender, EventArgs e)
        {
            string filePath = (sender as ImageButton).CommandArgument;
            Response.ContentType = ContentType;
            Response.AppendHeader("Content-Disposition", "attachment; filename=" + Path.GetFileName(filePath));
            Response.WriteFile(filePath);
            Response.End();
        }
        protected void DeleteFile(object sender, EventArgs e)
        {
            string filePath = (sender as ImageButton).CommandArgument;
            File.Delete(filePath);
            ExprotFileList();
            ClientScript.RegisterStartupScript(GetType(), "Val", "ShowExpPopup();", true);
        }

Posted 6-Nov-14 21:27pm

jithesh a

Updated 15-Sep-16 23:31pm

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3 solutions

Solution 1

Hi,

For Download action it requires a post back action, but in update panel post back action does not fires..
so you need to add trigger for the control to initiate download..

<asp:updatepanel runat="server" id="upPanel1" xmlns:asp="#unknown">
<contenttemplate>
//Contents
</contenttemplate>
<trigger>
<asp:postbacktrigger controlid="ID" />
</trigger>
</asp:updatepanel>

Posted 6-Nov-14 21:36pm

Magesh M N

Comments

jithesh a 7-Nov-14 3:40am

<asp:postbacktrigger controlid="ID" /> .Is this ID for 'lnkDownload' in above code?

Magesh M N 9-Nov-14 22:17pm

yes

jithesh a 9-Nov-14 23:02pm

Its not working

Solution 3

it is working in updatepanel

ASP.NET

</ContentTemplate>
  <Triggers>
        <asp:PostBackTrigger ControlID="GridView1" />
    </Triggers>
 </asp:UpdatePanel>

Posted 15-Sep-16 23:31pm

Tahir Mahmood From karachi

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jithesh a · Accepted Answer · 2014-11-09T18:33:00

Add a button Outside of updatepanel

<asp:button id="BtnDownload" onclick="DownloadFile_Click" runat="server" visible="false" xmlns:asp="#unknown" />

Javascript function

XML

function DownloadFile(filepath) {
           __doPostBack("<%= BtnDownload.UniqueID %>", filepath);
       }

XML

<asp:UpdatePanel ID="UpdatePanel2" runat="server" >
                       <ContentTemplate>
              <asp:GridView ID="GridImport" runat="server" AutoGenerateColumns="false" Width="99%" Height="50%"
                                   AllowPaging="true" GridLines="None" Style="padding: 15px; text-align: left; overflow: scroll;
                                   font-family: Arial; font-size: 11pt;" ShowHeaderWhenEmpty="true" PageSize="4"
                                   CssClass="Grid_LE" HeaderStyle-CssClass="Grid_Head" EmptyDataText = "No files Imported" OnPageIndexChanging="GridImport_PageIndexChanging"  >
               <Columns>
                   <asp:BoundField DataField="Text" HeaderText="File Name" />
                   <asp:TemplateField>

                       <ItemTemplate>
                             <asp:ImageButton ID="lnkDownload" runat="server" CommandArgument='<%# Eval("Value") %>'  Style="width: 20px; height: 20px;" ImageUrl="~/Images/download.png"  OnClick = "lnkDownloadNew_Click" />    <%--OnClick = "DownloadFile"  --%>
                       </ItemTemplate>
                   </asp:TemplateField>
                   <asp:TemplateField>
                       <ItemTemplate>
                             <asp:ImageButton ID="lnkDelete" runat="server" CommandArgument='<%# Eval("Value") %>'  Style="width: 20px; height: 20px;" ImageUrl="~/Images/cancel.png" OnClick="DeleteFile" />
                       </ItemTemplate>
                   </asp:TemplateField>
               </Columns>
           </asp:GridView>
       </ContentTemplate>

            </asp:UpdatePanel>

.cs

C#

protected void DownloadFile_Click(object sender, EventArgs e)
     {
         //var  filePath = Request.Form["__EVENTARGUMENT"];
         string filePath = ViewState["filepath"].ToString();
         Response.ContentType = ContentType;
         Response.AppendHeader("Content-Disposition", "attachment; filename=" + Path.GetFileName(filePath));
         Response.WriteFile(filePath);
         Response.End();
         ExprotFileList();
     }
     protected void lnkDownloadNew_Click(object sender, EventArgs e)
     {
         string filePath = (sender as ImageButton).CommandArgument;
         ScriptManager.RegisterStartupScript(this, typeof(ImageButton), "scr", "DownloadFile('" + filePath + "');", true);
         ViewState["filepath"] = filePath;

     }