public class UploadRequestProcessor
{
    public ObservableCollection<UploadRequest> UploadRequests { get; private set; }
    private readonly Dispatcher dispatcher;
    private readonly BlockingCollection<UploadRequest> uploadRequestsBlocking;
    private Task consumerTask;

    public UploadRequester(Dispatcher dispatcher)
    {
        this.dispatcher = dispatcher;
        this.UploadRequests = new ObservableCollection<UploadRequest>();
        this.uploadRequestsBlocking = new BlockingCollection<UploadRequest>();
        this.consumerTask = Task.Factory.StartNew(this.ConsumeUploadRequests);
    }

    public void AddUploadRequest(UploadRequest uploadRequest)
    {
        this.UploadRequests.Add(uploadRequest);
        this.uploadRequestsBlocking.Add(uploadRequest);
    }

    private void ConsumeUploadRequests()
    {
        foreach (var uploadRequest in this.uploadRequestsBlocking.GetConsumingEnumerable())
        {
            uploadRequest.Status = "Uploading...";

            Thread.Sleep(2000);
            uploadRequest.Status = "Successfully uploaded";

            Thread.Sleep(500);
            this.dispatcher.Invoke(() => this.UploadRequests.Remove(uploadRequest));
        }
    }
}