void _asyncLoadFunction_Completed(object sender, PictureBoxLoadCompletedEventArgs e)
{
if (LoadCompleted != null)
{
LoadCompleted(this, e);
}
}
static void pic_LoadCompleted(object sender, PictureBoxLoadCompletedEventArgs e)
{
Console.WriteLine("Picture Load Completed:{0}", e.ImagePath);
waitHandle.Set();
}