Create Zip File

public byte[] GetZipData()
{
    byte[] data;
    using (MemoryStream stream = new MemoryStream())
    {
        using (Package package = ZipPackage.Open(stream, FileMode.Create, FileAccess.ReadWrite))
        {
            // Wrap the rest of the using block in a for loop to iterate over files you want to
            // include in the package, this example only adds a single file.
 
            // Create the file to include in the zip
            Uri uri = PackUriHelper.CreatePartUri(new Uri("FileToIncludeInZip.txt", UriKind.Relative));
            PackagePart packagePart = package.CreatePart(uri, MediaTypeNames.Application.Octet, CompressionOption.Normal);
 
            using (Stream packagePartStream = packagePart.GetStream())
            {
                // Get content for file as byte array.
                byte[] packagePartData = Encoding.UTF8.GetBytes("content to write to FileToIncludeInZip.txt file");
                // Commit to package
                packagePartStream.Write(packagePartData, 0, packagePartData.Length);
            }
        }
 
        // Write stream content to data byte array
        data = new byte[stream.Length];
        stream.Position = 0;
        stream.Read(data, 0, Convert.ToInt32(stream.Length));
    }
 
    return data;
}
 
// Code in you aspx page, WebPart, control, etc. :
 
byte[] data = GetZipData();
 
Page.Response.Buffer = true;
Page.Response.ClearHeaders();
Page.Response.ClearContent();
Page.Response.AddHeader("Content-Length", data.Length.ToString());
Page.Response.ContentType = "application/zip";
Page.Response.AppendHeader("Content-Disposition", "attachment;filename=DownloadableZipFile.zip");
Page.Response.BinaryWrite(data);
Page.Response.Flush();
Page.Response.Close();

public byte[] GetZipData() { byte[] data; using (MemoryStream stream = new MemoryStream()) { using (Package package = ZipPackage.Open(stream, FileMode.Create, FileAccess.ReadWrite)) { // Wrap the rest of the using block in a for loop to iterate over files you want to // include in the package, this example only adds a single file. // Create the file to include in the zip Uri uri = PackUriHelper.CreatePartUri(new Uri("FileToIncludeInZip.txt", UriKind.Relative)); PackagePart packagePart = package.CreatePart(uri, MediaTypeNames.Application.Octet, CompressionOption.Normal); using (Stream packagePartStream = packagePart.GetStream()) { // Get content for file as byte array. byte[] packagePartData = Encoding.UTF8.GetBytes("content to write to FileToIncludeInZip.txt file"); // Commit to package packagePartStream.Write(packagePartData, 0, packagePartData.Length); } } // Write stream content to data byte array data = new byte[stream.Length]; stream.Position = 0; stream.Read(data, 0, Convert.ToInt32(stream.Length)); } return data; } // Code in you aspx page, WebPart, control, etc. : byte[] data = GetZipData(); Page.Response.Buffer = true; Page.Response.ClearHeaders(); Page.Response.ClearContent(); Page.Response.AddHeader("Content-Length", data.Length.ToString()); Page.Response.ContentType = "application/zip"; Page.Response.AppendHeader("Content-Disposition", "attachment;filename=DownloadableZipFile.zip"); Page.Response.BinaryWrite(data); Page.Response.Flush(); Page.Response.Close();