C#

while(!stopRequested)
{
  GetsAllFilesInTheDirectory
  lock(hashset)
    AddAllFilePathsToTheHashSet.

  if at least one file was added, set the manualResetEvent.

  Wait for some time (a minute?)
}

while(!stopRequested)
{
  manualResetEvent.WaitOne();

  if (stopRequested)
    break;

  manualResetEvent.Reset();

  lock(hashset)
  {
    foreach(var path in hashset)
    {
      ... do what you need...
    }

    hashset.Clear();
  }
}

lock(hashset)
  add the path of the file to the hashset.

manualResetEvent.Set();

Paulo Zemek wrote:

processed files will be removed

Paulo Zemek wrote:

keep an active TCP/IP connection

while(!stopRequested)
{  
	manualResetEvent.WaitOne();  
	if (stopRequested)    
		break;  
	manualResetEvent.Reset();  
	lock(hashset)  
	{    
		foreach(var path in hashset)    
		{
			... do what you need...    
		}    
		hashset.Clear();  
	}
}

private object hashsetLock = new object();

... and the thread code...
while(!stopRequested)
{
  manualResetEvent.WaitOne();
  if (stopRequested)
    return;

  HashSet<string> hashsetToProcess;
  manualResetEvent.Reset();
  lock(hashSetLock)
  {
    hashsetToProcess = hashset;
    hashset = new HashSet<string>();
    // now you can already free the lock. Note that all locks must now be 
    // to hashSetLock instead of hashset.
  }

  foreach(string item in hashsetToProcess)
    ... do what you need...
}

Name           Type1           Type2            Nullable Unique Read only
-------------- --------------- ---------------- -------- ------ ---------
KeyId          System.Guid     uniqueidentifier False    False  False
SearchIn       System.String   varchar(256)     False    False  False
SearchFor      System.String   varchar(256)     False    False  False
DeleteIt       System.Boolean  bit              False    False  False
VersionsToKeep System.Byte     tinyint          False    False  False
LastSearch     System.DateTime datetime         True     False  False