File Upload in C#

I am trying like :

string file1 = filepath + filename

string file2 = filepath + filename

string file3 = filepath + filename

DownloadFile(file1);

DownloadFile(file2);

DownloadFile(file3);

Using same Code in DownloadFile, only file name is different.

But After downloading file1 and on downloading file2, I am getting "Server cannot clear headers after HTTP headers have been sent" error

DownloadFIle code is :

Response.Clear(); Response.ClearHeaders();  Response.Buffer = true; Response.BufferOutput = true; 

Response.AddHeaders("COntent-Disposition", string.Format("attachment; filename = {0}{1}", FileName, type));

Response.Charset = ""; Response.ContentType = "application/pdf"; Response.TransmitFIle(url); Response.Flush();

Hi Sushant ,

You can easily download multiple files on pae load , here is the example code.

protected void Page_Load(object sender, EventArgs e)
{
    string folderPath = Server.MapPath("~/Files"); // Path to the folder containing the files

    if (Directory.Exists(folderPath))
    {
        string[] files = Directory.GetFiles(folderPath);

        foreach (string filePath in files)
        {
            string fileName = Path.GetFileName(filePath);
            string downloadUrl = "DownloadFile.aspx?file=" + Server.UrlEncode(fileName);
            Response.Write("" + fileName + "
");
        }
    }
}

Another Redirected Page Code of Page Load Are :

protected void Page_Load(object sender, EventArgs e)
{
    string fileName = Request.QueryString["file"];

    if (!string.IsNullOrEmpty(fileName))
    {
        string filePath = Server.MapPath("~/Files/" + fileName);

        if (File.Exists(filePath))
        {
            Response.Clear();
            Response.ContentType = "application/octet-stream";
            Response.AppendHeader("Content-Disposition", "attachment; filename=" + fileName);
            Response.TransmitFile(filePath);
            Response.End();
        }
        else
        {
            Response.Write("File not found.");
        }
    }
    else
    {
        Response.Write("Invalid file name.");
    }
}

Hello Sushant,

Please use this one which will help you out to download all files from specific folder,

using System;
using System.IO;

class Program
{
    static void Main()
    {
        string sourceDirectory = @"C:\SourceFolder"; // Specify the source directory path
        string destinationDirectory = @"C:\DestinationFolder"; // Specify the destination directory path

        // Get all files within the source directory
        string[] files = Directory.GetFiles(sourceDirectory);

        // Copy each file to the destination directory
        foreach (string file in files)
        {
            string fileName = Path.GetFileName(file);
            string destinationPath = Path.Combine(destinationDirectory, fileName);
            File.Copy(file, destinationPath, true);
        }

        Console.WriteLine("Files downloaded successfully.");
    }
}

Hi Sushant,

The best way is to zip all the multiple files and download the .zip file at the user end.

https://www.aspsnippets.com/Articles/Zip-a-Folder-Directory-and-Download-in-ASPNet-using-C-and-VBNet.aspx

Hope this will help you.

of course that is possible to do.
match your file using userId, or you can save file location to db with key userId. and then read the files using foreach.