C#

class MyHandle : SafeHandleZeroOrMinusOneIsInvalid {
    MyHandle() : base(true) {}

    [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
    protected override bool ReleaseHandle() {
        externalReleaseHandle(handle);
    }

    [DllImport("MyLib.dll")] extern void externalReleaseHandle(IntPtr handle);
}

class MyClass {
    public static void main(string[] args) {
        MyHandle h1 = externalCreateHandle();
        MyHandle h2 = externalGetPointer(h1);
    }

    [DllImport("MyLib.dll")] extern void externalCreateHandle();
    [DllImport("MyLib.dll")] extern void externalGetPointer(MyHandle handle);
}

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private static void LongProcess(int waitTime)
{
	Trace.WriteLine("LongProcess started");
	Thread.Sleep(waitTime);
	Trace.WriteLine("LongProcess finished");
}

private delegate void LongProcessDelegate(int waitTime);

private void Start()
{
	LongProcessDelegate lp = LongProcess;
	IAsyncResult ar = lp.BeginInvoke(2000, null, null);
	while(!ar.Completed)
	{
		Trace.WriteLine("Not finished yet");
		Thread.Sleep(100);
	}
	lp.EndInvoke(ar);
	Trace.WriteLine("All completed");
}

LongProcess started
Not finished yet
..
Not finished yet
LongProcess finished
All completed

LongProcess finished
Not finished yet
..
Not finished yet
LongProcess finished
All completed

Not finished yet
LongProcess finished
Not finished yet
..
Not finished yet
LongProcess finished
All completed

foreach (url in file("c:\\users\\jase\\desktop\\file_example.txt"))
     {
          streamwriter writeFile = new streamwriter("c:\\users\\jase\\desktop\\file.txt");
          writeFile.Write(urlstring);
          writeFile.Close
     }