C# - Read A Value Being Manipulated In Different Thread?

I'm trying to read a static property from a static class, which is being modified from a different thread.

Basically I have this static class:

public static class Progress{
public static int currentProgress{get; set;}
}

and this thread manipulating the currentProgress:

private void Job(){
for(int i = 0; i<100; i++){
Progress.currentProgress = i;
Thread.Sleep(1000);
}
}

While this is running, I have a HttpHandler trying to access this progress (every few seconds), like so:

public void ProcessRequest(HttpContext context) {
context.Response.Write(Progress.currentProgress.toString());
context.Response.End();
}

But the currentProgress is set to it's initialvalue here, while the workThread is working, and only when done, is the currentProgress updated.