FileProcessor ; Encode , Zip (with password) --> Unzip , Decode

FileProcessor.cs

public interface IFileProcessor
{
    void Process(string targetFile, string zippedFile);
    void UndoProcess(string zippedFile, string targetFile, string fileName);
}
    
public class FileProcessor
    :IFileProcessor
{
    private string dummyFilePath = FileProcessorConstants.DummyFilePath;
    private string encodedContent = String.Empty;
    private string originContent = String.Empty;

    public virtual void Process(string targetFile, string zippedFile)
    {
        // actual file = targetFile path
        // encoded -> zipped aith password = zippedFile path

        if (!File.Exists(targetFile))
            throw new ApplicationException("");

        try
        {
            originContent = FileHelper.GetStringByFile(targetFile); // ACTUAL FILE --> STRING
            encodedContent = SecureHelper.Encode(originContent); // STRING --> ENCODED STRING
            FileHelper.SetFileByString(dummyFilePath, encodedContent); // ENCODED STRING --> CUSTOM FILE FORMAT (with custom extention)
            ZipHelper.Zip(dummyFilePath, zippedFile); // CUSTOM FILE FORMAT --> ZIP FILE
        }
        catch (Exception)
        {
            throw new ApplicationException("");
        }
        finally
        {
            encodedContent = String.Empty;
            originContent = String.Empty;
        }
    }

    public virtual void UndoProcess(string zippedFile, string targetFile, string fileName)
    {
        // filename : test.xlsx - with file extention
        if (!File.Exists(zippedFile))
            throw new ApplicationException("");

        try
        {
            ZipHelper.UnZip(zippedFile, dummyFilePath); // ZIP FILE --> CUSTOM FILE FORMAT
            encodedContent = FileHelper.GetStringByFile(dummyFilePath); // CUSTOM FILE FORMAT (with custom extention) --> ENCODED STRING
            originContent = SecureHelper.Decode(encodedContent); // ENCODED --> STRING
            FileHelper.SetFileByString(targetFile + fileName, originContent); // STRING --> ACTUAL FILE
        }
        catch (Exception)
        {
            throw new ApplicationException("");
        }
        finally
        {
            encodedContent = String.Empty;
            originContent = String.Empty;
        }
    }
}