Welcome to the first, or actually, the episode number 0 of my first online course ever named “Becoming a software developer”. o what is it all about? The goal is simple – I’ll be acting as a mentor to a friend of mine Patryk Huzarski, who would like to become a software developer.

Nowadays, asynchronous programming isn’t something unusual. We all know that when it comes to do some I/O operations or HTTP request, we should do it async. Why? There’re several reasons but two most important  are:Efficiency. In many cases, the code might work faster. That’s because it’s not forced to wait for the result. Instead, it can work on some other stuff and then come back for the response when it’s ready. Simple is that.Comfort. Async improves the comfort of using our applications. We don’t blo...

It’s been a few months already since I’ve started working for good with distributed systems using (micro)services and asynchronous processing via service bus. Many issues and question raised and one of these was how to not lose the information about commands and events being processed and even more importantly, how to notify the user once the request has completed? I’ve had to come up with some solution that seems to be sufficient (at least for now) and I’d like to share it with you.

Kilka słów o tym, że nie zawsze idzie poprawnie wyszpiegować co siedzi w binarce. Czasami kod znacznie odbiega od rzeczywistości i to bez użycia obfuskacji.

Visual studio simplifies creating of WCF service by providing project templates. First way to create WCF service is to use the New Web Site option and then choose WCF Service. It will create a new web site with a sample WCF service implementation linked to a .svc file, with related configuration in the web.config file. In this approach Visual Studio does not just create the core WCF project and add the needed assembly references, but it also builds the host application.

Reading time ~1 minute This will be a fast errata to the previous one. This time I will expand the oldest performance mantra: The fastest code is the one that doesn’t execute. Second to that is the one that executes once Last time I’ve forgot to mention one very important optimization. It was one of two steps that allowed me to go from 1530 to 484 seconds in the sample run.Saga Before I go further here are some link to the previous posts on the problem of calculating similarities and then...

One thing that surprised me the most about the C# was the fact that it does not support multiple inheritances (which I knew from the C++). How can we deal with that? Of course, we use interfaces, since one class can implement more than one. But quickly we come to the very common problem...

Sometimes it happens that we use mechanisms/features of specific language without beeing aware of it. That’s fine, but if you’ll want to discuss your code in a future to the audience or coworkers, soon or later you’ll be forced to learn it and understand (or at least name it using technical nomenclature). Therefore, today I’m going to discuss two related „mechanisms” of C# which are covariance and contravariance.  Covariance Covariance is a type conversion from the specific type to the more general (ba...

Today I’ll show you a quite nice example of the Strategy pattern from a real project I was working on some time ago.

Not so long ago, I’ve eventually decided to dive into the world of microservices. I did look for an opportunity to make use of this architectural pattern for quite some time and finally was able to do so. After 3 months of trying out the new things and learning stuff mostly on my own (the hard way) I believe it’s a good time to share some of my experience. I have no doubts that at some point in the future when I look back at this post I might be like – “oh God, what was I thinking back then, it’s so wro...