Gridview Download not working properly in ASP.NET

Question

I'm developing asp.net page and it contains gridview.

Inside the gridview, i used link button for downloading the file.

The file contains in the File Server path (another server)

File path like ==> filename : "\DocServer121\Docs\S1Proj\EmpReview.xlsx"

i used below code and it is not working

Protected Sub btnDownload_Click(ByVal sender As Object, ByVal e As EventArgs)
Dim btnDownload As LinkButton = TryCast(sender, LinkButton)
        Dim gvrow As GridViewRow = TryCast(btnDownload.NamingContainer, GridViewRow)
        Dim fileName As String = grdResult.DataKeys(gvrow.RowIndex).Values(1).ToString()
        Response.ContentType = "image/jpg"
        Response.AddHeader("Content-Disposition", "attachment;filename=""" & fileName & """")
        Response.TransmitFile((fileName))
        Response.[End]()
End Sub

The downloading file is located in another server and not in the same server which is available in the application

Answer 1

Hi @Gani_tpt,

I'm just trying sample file from my system. but, nothing will happen in the browser.

Were you able to successfully get images from another servers?

can i have sample gridview download file wiht local and physical path of the server..?

If you want to work on your local system, you can upload the image to your current solution and then download it. Examples are as follows:

<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="btnUpload" runat="server" Text="Upload" OnClick="UploadFile" />
<hr />
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" EmptyDataText="No files uploaded">
    <Columns>
        <asp:BoundField DataField="Text" HeaderText="File Name" />
        <asp:TemplateField>
            <ItemTemplate>
                <asp:LinkButton ID="lnkDownload" Text="Download" CommandArgument='<%# Eval("Value") %>' runat="server" OnClick="DownloadFile"></asp:LinkButton>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:LinkButton ID="lnkDelete" Text="Delete" CommandArgument='<%# Eval("Value") %>' runat="server" OnClick="DeleteFile" />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

 Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
     If Not IsPostBack Then
         Dim filePaths() As String = Directory.GetFiles(Server.MapPath("~/Uploads/"))
         Dim files As List(Of ListItem) = New List(Of ListItem)
         For Each filePath As String In filePaths
             files.Add(New ListItem(Path.GetFileName(filePath), filePath))
         Next
         GridView1.DataSource = files
         GridView1.DataBind()
     End If
 End Sub
 Protected Sub UploadFile(ByVal sender As Object, ByVal e As EventArgs)
     Dim fileName As String = Path.GetFileName(FileUpload1.PostedFile.FileName)
     FileUpload1.PostedFile.SaveAs((Server.MapPath("~/Uploads/") + fileName))
     Response.Redirect(Request.Url.AbsoluteUri)
 End Sub
 Protected Sub DownloadFile(ByVal sender As Object, ByVal e As EventArgs)
     Dim filePath As String = CType(sender, LinkButton).CommandArgument
     Response.ContentType = ContentType
     Response.AppendHeader("Content-Disposition", ("attachment; filename=" + Path.GetFileName(filePath)))
     Response.WriteFile(filePath)
     Response.End()
 End Sub
 Protected Sub DeleteFile(ByVal sender As Object, ByVal e As EventArgs)
     Dim filePath As String = CType(sender, LinkButton).CommandArgument
     File.Delete(filePath)
     Response.Redirect(Request.Url.AbsoluteUri)
 End Sub

If you want to upload and download files from a remote server in ASP.NET, you can use the WebClient class. Detailed information can be found in this document.

How to upload and download files from a remote server in ASP.NET

Best regards,
Lan Huang

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