C#

public interface IDataWrapper
{
  object State{ get ; set ; }
  bool HasProcessed{ get; }
}

public interface IPlugin
{
  void Start();
}

public class MyPlugin : IPlugin, IDataWrapper
{
  private object _state;
  private bool _isSuccessful = false;
  public object State 
  {
    get { return _state; }
    set { _state = value; }
  }
  public bool HasProcessed
  {
    get { return _isSuccessful; }
  }
  // Do some processing with this...
  public void Start()
  {
    // Do something....
  }
}

IPlugin plugin = LoadPlugin(...);
IDataWrapper wrapped = plugin as IDataWrapper;
if (wrapped != null)
{
  wrapped.State = ...;
}

plugin.Start();

if (wrapped != null)
{
  if (wrapped.HasProcessed)
  {
    ...
  }
}

DirectoryInfo di = new DirectoryInfo(zipsPath);
di.Attributes = FileAttributes.Normal;
FileInfo[] zFiles = di.GetFiles("*.zip");

string tempZip = "/Programme/tempZips";
if (!Directory.Exists(tempZip))
Directory.CreateDirectory(tempZip);

for(int a=0;a< FileInfo.Lenght;a++)
{
File.Copy(FileInfo[a].FullName, tempZip, true); // true for overwriting
}

private void Form1_Load(object sender, EventArgs e)
{
// code if any
timer1.Enabled = true;
}

private void timer1_tick(object sender, EventArgs e)
{
timer1.Enabled = false;
// splash screen code 
}