C#

ZipInputStream sampleInputStream = new ZipInputStream(File.OpenRead(UnZIP_ZipFile)); 
            ZipEntry sampleFile = null;
            string sampleOutputDirectoy = UnZIP_RegFile; 
            int sampleSize = 2048;
            sampleInputStream.Password = "12345";
            while ((sampleFile = sampleInputStream.GetNextEntry()) != null)
            {
                sampleSize = 2048;
                if (Path.GetFileName(sampleFile.Name) != string.Empty)
                {
                    string sampleFilePath = sampleOutputDirectoy + @"\" + sampleFile.Name;
                    FileStream sampleFileStream = File.Create(sampleFilePath);
                    byte[] sampleFileData = new byte[sampleSize];
                    while (true)
                    {
                        sampleSize = sampleInputStream.Read(sampleFileData, 0, sampleFileData.Length);
                        if (sampleSize > 0)
                            sampleFileStream.Write(sampleFileData, 0, sampleSize);
                        else
                            break;
                    }
                    sampleFileStream.Close();
                    sampleFileStream.Dispose();
                }
                
            }
            sampleInputStream.Close();
            sampleInputStream.Dispose();
            MessageBox.Show(" ");