ZipHelper with Ionic.Zip ( http://www.nuget.org/packages/DotNetZip )

ZipHelper.cs

public static class ZipHelper
{
    public readonly static string ZipPassword = ConfigurationManager.AppSettings["ZipPassword"].ToString();
        
    public static bool Zip(string filePath,string TargetDirectory)
    {
        if (File.Exists(filePath))
            throw new ApplicationException("");
        if (Directory.Exists(TargetDirectory))
            throw new ApplicationException("");

        bool rv = false;
        try
        {
            using (ZipFile zip = new ZipFile())
            {
                zip.Password = ZipPassword;
                zip.Comment = "";
                zip.AddFile(filePath, "Files");
                zip.Save(TargetDirectory);
            }
        }
        catch (Exception ex)
        {
            rv = false;
        }

        return rv;
    }

    public static bool Zip(string[] fileNames,string TargetDirectory)
    {
        bool rv = false;
        try
        {
            for (int i = 0; i < fileNames.Count(); i++)
            {
                Zip(fileNames[i], TargetDirectory);
            }
        }
        catch (Exception ex)
        {
            rv = false;
        }

        return rv;
    }

    public static bool UnZip(string TargetDirectory,string filePath) 
    {
        bool rv = false;
        try
        {
            using (ZipFile zip=ZipFile.Read(filePath))
            {
                foreach (ZipEntry e in zip)
                {
                    e.ExtractWithPassword(TargetDirectory, ZipPassword);
                }
            }
        }
        catch (Exception ex)
        {
            rv = false;
        }

        return rv;
    }
}