Creating Zip file from stream and downloading it

Question

I have a DataTable that i want to convert it to xml and then zip it, using DotNetZip. finally user can download it via Asp.Net webpage. My code in below

Answer 1

Add a ContentType header:

Response.ContentType = "application/zip";

this will allow the browsers to detect what you are sending.

Answer 2

This code will help you in downloading a file from stream.

using (var outStream = new MemoryStream())
{
    using (var archive = new ZipArchive(outStream, ZipArchiveMode.Create, true))
    {
        var fileInArchive = archive.CreateEntry("FileName.pdf", CompressionLevel.Optimal);
        using (var entryStream = fileInArchive.Open())
        using (WebResponse response = req.GetResponse())
        {
            using (var fileToCompressStream = response.GetResponseStream())
            {
                fileToCompressStream.CopyTo(entryStream);
            }
        }                       
    }
    using (var fileStream = new FileStream(@"D:\test.zip", FileMode.Create))
    {
        outStream.Seek(0, SeekOrigin.Begin);
        outStream.CopyTo(fileStream);
    }
}

Namespaces needed:

using System.IO.Compression;
using System.IO.Compression.ZipArchive;