Create zip

ZipFuncs.cs

using System.Collections.Generic;
using System.IO;

namespace ZipLib
{
    public class ZipFuncs
    {
        public static byte[] CreateZipArhive(List<string> _pathin)
        {
            if ((_pathin ?? new List<string>()).Count > 0)
                using (Ionic.Zip.ZipFile zip = new Ionic.Zip.ZipFile())
                {
                    _pathin.ForEach(_path =>
                    {
                        zip.AddFile(_path,@"\");
                    });

                    using (var ms = new MemoryStream())
                    {
                        zip.Save(ms);
                        return ms.ToArray();
                    }
                }
            return null;
        }
    }
}