ReadProgress event never fires?

Dec 25, 2014 at 2:12 AM
I'm using this code;
using (ZipFile zip = ZipFile.Read(FileName))
        {
            zip.ExtractProgress += ExtractProgressHandler;    
            zip.ReadProgress += ReadProgressHandler;
            zip.ExtractAll(System.AppDomain.CurrentDomain.BaseDirectory + Library + zip.Comment,ExtractExistingFileAction.OverwriteSilently);               
        }
But, ReadProgress event never fires. I think i need to add event handler before using ZipFile.Read(). But i don't know how to do.