Download File From Server In Asp.Net

In this example i'm explaining how to Download Files From Server In Asp.Net and display Save As dialog box when a hyperlink is clicked on the site.

I have created a folder on server and stored some sample files to download.

First we need to write code to display names of all the files saved in Files folder as hyperlinks so that user can download these files.

You can read to know how to Save Files In Sql Database And Download From GridView In Asp.Net

Write below mentioned code inPage_Load event of page where you want to display all the links with file names.

C# CODE

01protected void Page_Load(object sender, EventArgs e)

02    {

03        DirectoryInfo directory = new DirectoryInfo(Server.MapPath("~/Files"));

04        int counter = 0;

05        foreach (FileInfo file in directory.GetFiles())

06        {

07            HyperLink link = new HyperLink();

08            link.ID = "Link" + counter++;

09            link.Text = file.Name;

10            link.NavigateUrl = "Default2.aspx?name="+file.Name;

11 

12            Page.Controls.Add(link);

13            Page.Controls.Add(new LiteralControl("<br/>"));

14        }

15    }

VB.NET CODE

01Protected Sub Page_Load(sender As Object, e As EventArgs)

02 Dim directory As New DirectoryInfo(Server.MapPath("~/Files"))

03 Dim counter As Integer = 0

04 For Each file As FileInfo In directory.GetFiles()

05  Dim link As New HyperLink()

06  link.ID = "Link" & System.Math.Max(System.Threading.Interlocked.Increment(counter),counter - 1)

07  link.Text = file.Name

08  link.NavigateUrl = "Default2.aspx?name=" + file.Name

09 

10  Page.Controls.Add(link)

11  Page.Controls.Add(New LiteralControl("<br/>"))

12 Next

13End Sub

Add a new web form Default2.aspx in the soulution and write code mentioned below in Page_Load Event.

C# CODE

1protected void Page_Load(object sender, EventArgs e)

2    {

3        string fileName = Request.QueryString["name"].ToString();

4        Response.ContentType = "application/octet-stream";

5        Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);

6        Response.TransmitFile(Server.MapPath("~/Files/" + fileName));

7        Response.End();

8    }

VB.NET CODE

1Protected Sub Page_Load(sender As Object, e As EventArgs)

2 Dim fileName As String = Request.QueryString("name").ToString()

3 Response.ContentType = "application/octet-stream"

4 Response.AddHeader("Content-Disposition", "attachment;filename=" & fileName)

5 Response.TransmitFile(Server.MapPath("~/Files/" & fileName))

6 Response.[End]()

7End Sub