If you create entries with filenames relative to the root directory of the archive as the zip is a separate directory structure it will create subfolders. For example, if you create an entry with entry name "folder/file.ext" this will result in zip
file containing a folder named "folder" and in this folder there will be a file named file.ext.
Another way to zip entire directory with all of its subdirectories and files is to use the ZipFile.CreateFromDirectory located in Telerik.Windows.Zip.Extensions.dll assembly.
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