How to download file using C#?

In some of the cases we need to download file from the Internet, In this article I am explaining-

How to download file using C#?

For this I have used WebResponse, WebRequest Classes so we need to include System.Net Namespace.To download the file from Internet we have to make request to particular object so that I have used webRequest class object. After getting the response from the server we need to handle that response so I have used webResponse class object.

For displaying downloading process I have used ProgressBar control.

Here is the code-

 private void btnDownLoadFile_Click(object sender, EventArgs e)
        {
           
            WebRequest requestObj ;
            WebResponse responseObj;
            Stream readerData ;
            Stream writerData ;
            byte[] data = new byte[1024];
            int count = 0;
            int total = 0;
            this.Text = "Downloading file .....";
           
            string DestinationFileName= "TargetLocation";
            string SourceLocation= "SourceLocation";

            Application.DoEvents();

            try
            {
                requestObj = WebRequest.Create(SourceLocation);
                responseObj = requestObj.GetResponse();
                readerData = responseObj.GetResponseStream();
                progressBar1.Maximum = Convert.ToInt32(responseObj .ContentLength);
                progressBar1.Value = 0;
                total = 0;
                writerData = File.Create(DestinationFileName);
                while (true)
                {
                    count = readerData .Read(data, 0, 1024);
                    if (count <= 0)
                    {
                        break;
                    }
                    writerData.Write(data, 0, count);
                    total += 1024;
                    if (total < progressBar1.Maximum)
                        progressBar1.Value = total;
                    Application.DoEvents();
                }
                readerData .Close();
                writerData.Close();
                MessageBox.Show("Download completed...");
            }
            catch (Exception ex)
            {  
                MessageBox.Show("Error: " + ex.Message);
            }
        }


In above code, I am making request to download file using WebRequest Class object, for that I am passing source file url to download file.

 requestObj = WebRequest.Create(TargetLocation);

After making request we will get response, using this line of code-

  responseObj = requestObj.GetResponse();

Now using using Stream class object I am reading and writing data to the target file.

 count = readerData .Read(data, 0, 1024);

 writerData.Write(data, 0, count);

Meanwhile for displaying the download process, I am showing progressbar. Based on data read and write progressbar value will be increased which will show downloading process.


Output-

Thanks