Downloader in ASP.net

Introduction

Today, I am demonstrating a down loader in ASP.net using  with System.Web.WebRequest and System.Web.WebResponse method, if we need to start download on specific length then we can add request range using with Request.Addrange(10000,50000).

Down loader in ASP.Net

There is thousands of C# downloader available on internet. We can devise a program to download data from specific web location and put locally on our drive. Here I am providing a program which demonstrates how can we make a program to down loader in asp.net.

Namespace C#

using System.IO;
using System.Web;
using System.Configuration;

Namespace VB.Net

Imports System.IO
Imports System.Web
Imports System.Configuration
Imports System.Exception

We can provide file size here, so all the bytes streams will be downloaded properly.
I have made web request using HTTPWebRequest method:

HTTPWebRequest method:

System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(str);

Request Timeout

You can set request timeout as follows:
request.Timeout = 30000000;

Read Buffer Size

int read = strm.Read(inBuf, 0, inBuf.Length);

Here we can provide to read file from 0 bytes to up to your requirement.

Start VB.Net Code Snippet

Private Sub DownloadCode()
Try
       Dim filesize As Integer = 9899267
   Dim fs As FileStream = New FileStream("C:\downloadfolder\1.mp3", FileMode.Create, FileAccess.Write)
   Dim file_start As Integer = 0
   Dim file_end As Integer = filesize
   Dim strm As Stream = Nothing
   Dim offset As Integer = 0

   While file_end >= file_start
   Dim str As String = "http://www.downloaddomain.net/abc/1.mp3"
       'daisy server --- dbt_001
       Dim request As System.Net.HttpWebRequest = CType(System.Net.HttpWebRequest.Create(str), System.Net.HttpWebRequest)
       'Dim request As System.Net.HttpWebRequest = WebRequest.Create(str)
       request.Timeout = 30000000

       Dim inBuf(4095) As Byte  'for dtb_001

       Dim bytesToRead As Integer = CInt(inBuf.Length)

       Dim bytesRead As Integer = 0

       Dim response As System.Net.HttpWebResponse = CType(request.GetResponse(), System.Net.HttpWebResponse)
       'Dim response As HttpWebResponse = request.GetResponse()

       strm = response.GetResponseStream()

       Dim read As Integer = strm.Read(inBuf, 0, inBuf.Length)

       fs.Write(inBuf, 0, read)
       offset += read

       If offset >= file_end Then
           Exit While
       Else
           file_start += 4095
       End If
       request.Abort()
       response.Close()

   End While

   MessageBox.Show("file Downloaded successfully")
        Catch ex As Exception
   MessageBox.Show("file download unsuccessful" & ex.Message)
        End Try
    End Sub

C# Down loader code

Private void DownloadCode()
    {
    try
     {
     int filesize = 9899267;
     FileStream fs = new FileStream("C:\\downloadfolder\\1.mp3", FileMode.Create, FileAccess.Write);
     int file_start = 0;
     int file_end = filesize;
     Stream strm = null;
     int offset = 0;

     while (file_end >= file_start) {
      string str = "http://www.downloaddomain.net/abc/1.mp3";
      //
      System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(str);
      //Dim request As System.Net.HttpWebRequest = WebRequest.Create(str)
      request.Timeout = 30000000;

      byte[] inBuf = new byte[4096];
      //for dtb_001

      int bytesToRead = Convert.ToInt32(inBuf.Length);

      int bytesRead = 0;

      System.Net.HttpWebResponse response = (System.Net.HttpWebResponse)request.GetResponse();
      //Dim response As HttpWebResponse = request.GetResponse()

      strm = response.GetResponseStream();

      int read = strm.Read(inBuf, 0, inBuf.Length);

      fs.Write(inBuf, 0, read);
      offset += read;

      if (offset >= file_end) {
         break; // TODO: might not be correct. Was : Exit While
      }
else
{
         file_start += 4095;
      }
      request.Abort();
      response.Close();

     }

     MessageBox.Show("file Downloaded successfully");
     }
    catch (Exception ex)
    {
     MessageBox.Show("file download unsuccessful" + ex.Message);
    }
}

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