Thread: File Download code in asp.net.

Hi. I am first year MCA student. I am doing one project. In that project one download section there. For that I want download code. I tried different code but none of them worked out. Please help me as soon as possible. It is highly appreciated. Thanks in advanced.

It is very simple. Have you tried below code to file download? If not then try this

Code:

Response.ContentType = "test.doc";
Response.AppendHeader("Content-Disposition","attachment; filename=SailBig.jpg");
Response.TransmitFile( Server.MapPath("~/download/test.doc") );
Response.End();

I suggest you to refer following illustration, which will give you something idea about the use of this:

Code:

private void DownloadFile( string fname, bool forceDownload )
{
  string path = MapPath( fname );
  string name = Path.GetFileName( path );
  string ext = Path.GetExtension( path );
  string type = "";
  // set known types based on file extension  
  if ( ext != null )
  {
    switch( ext.ToLower() )
    {
    case ".htm":
    case ".html":
      type = "text/HTML";
      break;
  
    case ".txt":
      type = "text/plain";
      break;
     
    case ".doc":
    case ".rtf":
      type = "Application/msword";
      break;
    }
  }
  if ( forceDownload )
  {
    Response.AppendHeader( "content-disposition",
        "attachment; filename=" + name );
  }
  if ( type != "" )   
    Response.ContentType = type;
  Response.WriteFile( path );
  Response.End();

Refer the following code which is given below. It is very simple understand.

Code:

<%@ Page language="vb" runat="server" explicit="true" strict="true" %>
	<script language="vb" runat="server">
	Sub Page_Load(Sender As Object, E As EventArgs)
	    Dim strRequest As String = Request.QueryString("file") '-- if something was passed to the file querystring
	    If strRequest <> "" Then 'get absolute path of the file
	        Dim path As String = Server.MapPath(strRequest) 'get file object as FileInfo
	        Dim file As System.IO.FileInfo = New System.IO.FileInfo(path) '-- if the file exists on the server
	        If file.Exists Then 'set appropriate headers
	            Response.Clear()
	            Response.AddHeader("Content-Disposition", "attachment; filename=" & file.Name)
	            Response.AddHeader("Content-Length", file.Length.ToString())
	            Response.ContentType = "application/octet-stream"
	            Response.WriteFile(file.FullName)
	            Response.End 'if file does not exist
	        Else
	            Response.Write("This file does not exist.")
	        End If 'nothing in the URL as HTTP GET
	    Else
	        Response.Write("Please provide a file to download.")
	    End If
	End Sub
	</script>

Follow the given steps:

1. Make a new ASP.NET project

2. Add a new form called downloadtest.aspx and paste this part of code in the aspx file page_load procedure.

Code:

Private Sub Page_Load( ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Response.ContentType = "applicationoctet-stream"
 Dim filename as string=new string("c:\downloads\testdoc.docx") 
        Dim downloadFile As System.IO.FileStream = New System.IO.FileStream(filename, IO.FileMode.Open)
        Response.Write(downloadFile.Length() & "#")
        downloadFile.Close()
        Response.WriteFile(filename)
        Response.Flush()
        Response.End()
End Sub