Download a file in C#

Question

Good Afternoon, I’m a beginner in C# and I’ve already looked for this answer here on the internet and I didn’t find it at all, I’m working with C# and windows Forms, I have a folder inside my application called img and I have a pdf file inside it, I would like when the customer clicks on the button he downloads that pdf file to the client’s computer downloads folder. How can I do that? I’ve tried everything and I can’t.

  //Baixar Pdf
        private void toolStripButton11_Click(object sender, EventArgs e)
        {
            
                this.DownloadFile("img\\Ajuda.pdf", "Ajuda.pdf");
         }

Answer 1

Actually you don’t have to download, you need to copy the file to the folder Downloads. This code will help you:

    string finalPath = Path.Combine(System.Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), "Downloads\\Ajuda.pdf");
    System.IO.File.Copy("img\\Ajuda.pdf", finalPath);

Methods used:
File.Copy
Path.Combine
Environment.Getfolderpath

Answer 2

I found a code in Stack Overflow (English) for what you want to do. It’s a little different, but it’s for the same need.

    protected void btnUpload_Click(object sender, EventArgs e)
    {
      if(string.IsNullOrEmpty(txtName.Text)) return;            
       Response.ContentType = "application/octet-stream";
       Response.AppendHeader("Content-Disposition", "attachment;filename=" + txtName.Text);
       string filePath = Server.MapPath(Path.Combine("~/SavedFolder/PDF", txtName.Text));
       Response.TransmitFile(filePath);
       Response.End();
    }

Source: https://stackoverflow.com/questions/24402035/how-to-download-pdf-file-from-files-on-button-click