.NET Fest 2019

Uncovering Swagger/OpenAPI

If you've ever had to document an API, chances are you've used Swagger (OpenAPI) for it. But what IS that, exactly?
In this session we'll dive underneath the covers of OpenAPI. We'll cover documenting an ASP.NET Core API, but we won't stop there: we'll also learn how OpenAPI can help with API test generation and code generation.

OpenID Connect In Depth

You've used OpenID Connect. You know a thing or two about OAuth. But have you ever wondered how to achieve Single Sign-On between Angular & ASP.NET Core MVC apps, and automated Single Sign-Out? How, and why, to work with reference tokens? How to create a custom grant, and for what use case that might be a good idea?
In this in-depth session we'll cover all of these topics, extensively using IdentityServer4 in the process. Note that some previous knowledge on securing ASP.NET Core applications with OpenID Connect is a must.

Daily Performance Fuckups

.NET has accustomed us to writing code quickly and without thinking about what is going on underneath. Unfortunately, convenience comes with additional cost. It is very easy to lose the performance of our component through simple statement or code block which behaves differently than we thought. I will focus on the everyday performance traps, which can spoil your hard effort.

Design and development of Big Data solutions with Microsoft Azure

In this report, the author will talk about the experience of building high-load Big Data solutions based on Microsoft Azure. Special attention will be paid not only to architectural approaches and best practices, but also to many nuances, potential subtle points and pitfalls. In each case, practical advice, cheat sheets and options will be given. These options shall help with the choice of the best possible approaches and allow to avoid potential problems. The author will also talk about the experience of solving another common task - designing the Rules Engines for real-time data analytics.

When SQL Server Best Practices Do not Work

Best Practices in many areas are our good friends, they help us much. Sometimes we even apply them blindly and that works fine. But, in any case, our experience and knowledge should come to the first place, while Best Practices only second. Because there are situations and conditions which are way beyond the common rules. In those situations, a very uncommon, or even dangerous solution can give much better results than the common one. And you know, when I use the word dangerous, it is dangerous, and all these solutions should be applied very carefully. In this session, we will see a couple of such situations, embrace Best Practices and the Best solution (which actually do not follow Best Practices), and the ways to implement that solution safely.

NUKE - Modern Build Automation for C#/.NET

Founded in April 2017, NUKE is a free, open-source build automation system for C#/.NET that runs cross-platform on .NET Core, .NET Framework, and Mono. While builds are bootstrapped with conventional Bash or PowerShell scripts, their actual implementation resides in simple C# console applications. This approach unleashes the power of the type system and natively provides IDE features like code-completion, refactorings, and debugging. A custom global tool and several IDE extensions further improve how build projects are setup, authored and executed. A revolutionary code-generation approach ensures scalable integration of third-party tools like MSBuild or dotnet CLI. Come to this talk if you want to learn how to write maintainable and reliable builds with NUKE, which are also easily understood by everyone in your team!

Machine Learning for .NET developers

Did you know that you can add machine learning capabilities to almost any project? And now you don’t have to learn a new language (such as Python or R) and gain data scientist degree. In this talk I’ll provide some machine learning basics and show how you can easily start using machine learning in your .NET applications via ML.NET and other offerings from Microsoft.

.NET Core 3.0 and the future of .NET platforms

A new version of .NET Core platform - .NET Core 3 is coming in September 2019. In this talk I’ll cover the benefits of .NET Core compared to .NET Framework, will highlight new features of .NET Core 3 and hare Microsoft’s plans regarding the future of all .NET Frameworks.

Around the world in a session! Globalization and localization of software

We live in a global economy, as the internet allows you to reach customers everywhere. Creating localized websites for global audiences targeting different cultures and (human) languages will allow your software to reach a wider audience. In this session, you’ll learn the key facets of building global-reaching software such as how to deal with calendars, dates, times, and time zones as well as number and symbol representation (decimals, currency, dates).

When IoT Meets Serverless

IoT is not the future anymore. It is happening right here and right now. There are more and more applications for deploying tiny electronic devices and companies are starting to see the value in this approach. To meet the high demand for IoT solutions, Microsoft invested 5 BILLION dollars in their IoT services last year.
Developing and deploying IoT code using Azure services is easy. The hard part is supporting the large amount of data that comes with it. By using the classic approach for developing backend services, scalability, maintenance, deployment and deciding frameworks are the biggest nightmares any architect will face.
Serverless computing comes to solve these issues and allows us to focus on what matters most – the logic. In this session we will discuss the differences between the classic backend approach and the new serverless approach. We will go over the services that Azure provides us for IoT development and how we can connect them to other services on Azure to create a completely serverless system, which will save us development and maintenance time.

Biometric security in ASP.NET Core with IoT and Cognitive Services

This session presents a specific usage of custom authorization policies in ASP.NET Core for restricting physical access to buildings when an unauthorized intrusion is detected. IoT-enabled CCTV cameras are used for transmitting captured data to an IoT Hub in Azure, Cognitive Services recognize face and voice of the person requesting access to the site, and if an intrusion is detected, its severity is assessed by an anomaly detection service built in Azure Machine Learning. At the end, an API authorize access by sending a confirmation code back to the door's lock via the IoT Hub.

Design Blockchain Applications as Microservices

Microservices and blockchain smart contracts have a lot in common. They’re both expected to run in isolation (on-chain) and communicate with the outside (off-chain) via a message-based channel. They should both be small in size, developed to run auto­nomously and independently, and perform better when they’re deployed on a decentralized network.
This session presents design principles, artifacts and code samples for building blockchain applications using a microservice architecture style and deploying them on the Microsoft Azure Blockchain platform.

Azure App Service deep dive

Believing it is the most powerful PaaS service of the entire public cloud, I will share with you all the most interesting features of App Service and the good tips from the field, to see how to properly use it in production and focus on applications, instead of governance.
I will dig into the architecture, the deployment options, the runtimes, the secrets management, logging and troubleshooting and into some advanced high-scale scenarios. If you never used this, you will say ""ok, how did I survive without it?"".

Provisioning Azure PaaS fluently with Management Libraries and C#

In these days, automation is the key to reduce the effort in governing complex system. Also, it reduces mistakes of manual, repetetive, operations. Despite the standardization of common approaches using text-based Infrastructure-as-code definitions, as YAML or JSON, I will suggest to write your provisioning templates using C# and .NET, against Microsoft Azure.
In this demo-only session, we'll see the Azure Fluent Management Libraries in action to create a multi-tenant environment with strong-typed objects and compile-type-safe provisioning code.

Forget about HTTP

Microservices should be autonomous and independent, but what happens when your business domain doesn’t allow it, and you need to get data from other microservices? You’ll soon realize that simple HTTP calls are not enough anymore, or that your app is more brittle than ever and then you switch to messaging. With messaging you need to have a different mindset and be willing to embrace new challenges.
In this session, we’ll explore different ways of getting data from one ‘micro-service’ to another and while doing that we’ll talk about the benefits or the drawbacks of choosing an approach or another.

How to build & support high load REST API

I would like to tell the story of our experience of building the HighLoad REST API that has the following parameters:
* Intuitive
* Scalable
* Fault tolerant
* Protection from attack
* High bandwidth
Also I would like to describe:
* how we did LoadTesting
* how we survived a lots of DDoS attacks

* how we did deployment without downtime
The following list of technologies were used: .NET Core 2, ASP.NET Core 2, Consul, Fabio, Orleans.NET, Kafka, RabbitMQ, Serilog, xMetrics, Grafana, ELK

Architecting Blazor Applications. An Angular inspired approach

Blazor is certainly a technology for the future seen that the server-side hosting model is already part of .NET Core 3.0 and that the client-side hosting model is planned to be shipped in .NET 5. Therefore, we can start building cool Blazor application! But how to architect them? What goes where and how can we wire everything up? During this session we’ll try to sketch some Blazor architectural principles inspired by Angular. This means that we’ll cover topics like component design, component types, folder structure, communication patterns and services. All aspects will be backed by relevant code samples from a Blazor application created using these architectural principles.

Digital Twin technology. Next revolution in manufacturing

As the adoption of smart building technology increases around the world, what began as a desire to improve energy management in office spaces is expanding to encompass new goals and verticals. In that case, during the presentation we Learn how the underlying Internet of Things (IoT), artificial intelligence (AI), digital twins technologies are helping to overcome smart building adoptionchallenges and deliver new benefits.

6 Lessons I Learned on My Journey from Monolith to Microservices

For the past couple of years it seems that Microservices is all the rage. We want to use Microservices, we want to decompose into Microservices and we want Microservices to be a part of our world. While modern tools and platforms such as Docker, Kubernetes, Service Mesh and the public cloud help in implementing and maintaining such systems, the reality is that many fail even before the first line of code was written. This can happen for many reasons; Perhaps you chose a Microservices architecture for the wrong reasons? Maybe the organization wasn't ready for it? Or just possibly - the proposed architecture didn't embrace the true meaning of Microservices?
As the CTO of a software services company I get tackle these questions a lot. Join me in this session as I provide my perspective on transitioning from Monolith to Microservices through lessons learned in the real world, while architecting and implementing multiple Microservices based software systems at various customers.

Create Your Own Serverless PKI with .NET & Azure Key Vault

A Public Key Infrastructure (PKI) is the basis of modern system authentication; X.509 certificates are at the core of modern cryptography. Building your own PKI is not for the faint of heart, so we usually buy our certificates from an external Certificate Authority or operate a 3rd-party off-the-shelf PKI.
But what can you do if you need to issue your own certificates while keeping your costs low? What if, for example, you're in the business of manufacturing millions of IoT devices and you need to issue a certificate to each and every one of them? And to top it off - you want to do it in a Serverless manner?
Join me in this session, as we build a Serverless PKI system with Azure Functions & Key-Vault and learn all about Key-Vault's capabilities in regards to X.509 certificates along the way.

DotNet Core in production

During this talk, I'm going to tell you the real experience that we got trying to run DotNet core microservices in the production K8S environment under load. What issues did we face? How did we diagnose them? What we did to avoid them in the future? Why did we migrate into the cloud? Why dotNet Core 2.2 can be painful? All there questions will be answered during the talk to save your time and countless hours of DevOps team.

High-performance code design patterns in C#

More and more effort is being seen in .NET ecosystem put into the performance. Quite often we are seeing a new benchmark or blog post about memory allocations being reduced or overall throughput is increased. But how all this is achieved? Can any common code patterns be recognized, named and summarized in a modern C#, at the times of C# 8.0 and .NET Core 3.0/.NET 5? Can we provide a kind of Gang Of Four "design patterns" counterpart in the context of performance? As I believe so, in this talk a propose such a list of patterns, altogether with the rationale behind them and practical use cases. Please, feel invited to the world of common ways of using stackallocs, Span of T, pipelines, parallel processing and more.

Async lifetime tests with xUnit and AutoFixture

In this talk Andrii will go through the internals of a basic service written with CQS pattern, which handles incoming command requests and publishes events that describe state transitions of the system. Afterwards he will describe common ways of testing such service and explain pros and cons of the existing approaches. Then he will introduce AutoFixture and show how it can make tests much cleaner and configuration more composable by injecting parameters into a test method, will explain exiting issues with asynchronous test initialization and disposal and will show how to work it out with the help of some lightweight integration mechanism between xUnit and AutoFixture.

Hot Chocolate: GraphQL Schema Stitching with ASP.Net Core

GraphQL is a great way to expose your APIs and it has changed the way we think about consuming data over HTTP. With GraphQL we want to have one schema that provides all the data to us in a consistent way, enabling us to drill into the graph and fetch with one request what we actually want instead of having to issue multiple requests.
In the real world, however, we more often build small services that serve certain use cases. Simpler services are easier to maintain and can be deployed more rapidly. Moreover, we often also want to use external services that are not built by us. Ultimately, we will end up with multiple APIs again.
The solution for this dilemma is schema stitching. This talk will explore the schema stitching capabilities on ASP.Net Core with Hot Chocolate. We will show how you can set up a Hot Chocolate GraphQL gateway in under 5 minutes and move on to the various stitching scenarios.
This talk introduces simple auto-stitching scenarios and goes on to demonstrate how you can rewrite your GraphQL APIs into something truly new.

Tackling Dreaded .NET serverless Cold Starts

Out of all the runtimes supported by serverless vendors, .NET has the worst performance when it comes to cold starts. That means .NET developers are more reluctant to take up serverless which leads to two issues. The impediment in the growth of serverless, and the threat of the .NET community being left out of the serverless revolution. Hence it is necessary to know where serverless fails .NET developers, what is being done by the companies such as AWS and Azure to improve this, and how developers can overcome the problem with a combination of best practices and development tools.

Monadic parser combinators in C# (a simple way to write parsers for complex languages)

Everyone has written parsers before, but few know how to parse HTML without regular expressions. For the longest time, I thought of parsing languages with recursive grammar as something akin to black magic, while people who wrote compilers and designed DSLs were nothing short of sorcerers to me. But it turned out to be simpler than I thought. During this presentation I will talk about parsers in general, what they are used for and what kinds of parsers there are. Most importantly, I will talk about how we can use approaches from functional programming when writing parsers, as opposed to more tradiional approaches. We will also quickly code a working JSON parser to serve as a proof of concept.

Architecting .NET solutions in a Docker ecosystem

You must have noticed how Docker and containers is playing a more and more important part in .NET development. Docker support is everywhere, so it should be easy to build solutions based on container technology, right? But, it takes a bit more to architect and create a .NET solution that use Docker at its core. Many questions arise: How do you design a solution architecture that fits well with containers? Would I use .NET or .NET Core? What is a proper way to migrate to such an architecture? What changes in the .NET implementation from pre-Docker solutions with micro-services? Where do container orchestrators fit in and how do I build and deploy my solutions on a Docker container cluster, such as Azure Kubernetes Service?
These and many other questions will be answered in this session. You will learn how to design and architect your .NET solutions and get a flying start to create, build and run Docker-based containerized applications.

Test automation for developers

Traditionally developers only write unit tests (hopefully!) and QA engineers write System tests, with Selenium or some other tool. However, while this separation has some reasons, it's also a bit arbitrary and unhealthy. In this talk we'll discuss why you should be involved in all kinds of test automation and discuss best practices for utilizing the test automation to improve the development lifecycle, as well as both the internal and the external quality of your code.

Techniques for writing high-quality code

Do you want to take your development skills to the next level? Do you want to write high quality, maintainable, reusable, and extensible code? In this session, we’ll look at what is high quality code. You’ll learn how to take on the right amount of technical debt, how processes like Agile can help or harm a project, what to do with all the patterns out there, and how little things shift code to be better. Buckle up for a waterfall of takeaways and techniques for making code better and healthier.

Microservices from the trenches. When buzzwords don’t make your application work

“Microservices” is certainly a buzzword. Everybody wants to work on microservices applications. However when working on such a project you’ll soon realize that a buzzword doesn’t magically make your application work. And there will be a lot of challenges that you’ll face on this journey. During this session I will share my experience from the trenches of a microservices project aiming to make developers aware of the different challenges you’ll mostly won’t see at conferences. I will also try to illustrate my experiences with relevant code samples.

The future of Web: what Microsoft Blazor can do for you

In this presentation, I will talk about Microsoft Blazor, the newest Single Page Application of .NET Core platform. That will contain concepts of Web Assembly, the future of Web technologies in the .NET platform and a detailed live demo.

Implementing Domain Driven Design

“Domain Driven Design is an approach to software development for complex needs by connecting the implementation to an evolving model.”
While there are many resources on the web about the DDD, they are generally theoretical rather than useful practical guides. One reason is that a DDD implementation quite varies depending on your domain and culture. However, it is still possible to provide some explicit rules those can help you while designing your code base.
This talk starts by introducing the DDD and providing a layering model based on the DDD and the Clean Architecture. It then introduces the core building of an application built on the DDD principles.
In the second part of the talk, it shows some strict coding rules for the core building blocks with real code examples and suggestions. These rules are essential to build a large scale application implements DDD patterns & practices.
While the solution structure and code samples are based on .NET and C#, the talk is useful for developers and architects working with any server side technology.

Practical serverless use cases in Azure with a trick or two

Serverless technology is trending, but in-depth details are missing. How does it fit with non-serverless components? What are the practical use cases? Should you fight vendor lock-in? And what about limits and pitfalls with Azure? I will answer those questions, share a few tricks and short demo.
I'll cover serverless usage scenarios with Azure, what problems can be solved, and what is a viable adoption strategy. Then I'm going to talk about technology shortcomings, when to omit it and how to rip all benefits. There are circumstances when a cloud-agnostic approach is beneficial, so I discuss serverless frameworks too and why vendor lock is not that bad. Finally, we'll look at a short demo that illustrates why you have to use specific serverless patterns.

How to measure relationships within the Company using .Net

The majority of companies are struggling with an issue of growth where they started from handful group of people and reached 1000+ employees. In case of small groups the relationships remind family’s connections so everyone knows each other personally and the atmosphere is warm and charm whereas starting from 500+ to 1k keep it as family is tough and most of the companies come up with processes on one hand and culture on other. There ain’t no silver bullet how to manage it and in the end of the day they are balancing working a lot about good atmosphere in company and setting up relationships between teams. The issue isn’t new however tools and approaches evolved a lot this is where .NET Core and ML.Net comes in handy. These days AI/ML take over the world and bots as one of implementations are already a part of our life therefore our entuthiastic team created a bot using latest .NET Bot Framework v4 who helps managers to “measure” atmosphere in teams and crucial to socialize teams leveraging the power of ML.NET.

Micro-optimizations in .NET world

What to do in case everything cacheable has been already cached but the code still works too slowly? In the speech we will discuss how some low-level mechanisms work in .NET and how we can gain precious seconds with their help when we count every CPU tick.

Knowledge mining with Azure Search

Uncover latent insights from all your content — documents, images, and media – with Azure Search. Using the only cloud search service with built-in AI capabilities, discover patterns and relationships in your content, understand the sentiment, extract key phrases and more. In this presentation, you will learn more about Azure Search, Forms Recognizer, Cognitive Skills and how to improve understanding of your data. This presentation will be interesting for developers and architects, DevOps, and Data Scientists.

How serverless makes Integration TDD a reality. Why we do need it.

Do you recall those buzz words like TDD, BDD? Yep, but we know their problems as well!
TDD is too granular. BDD is too coarse-grained.
Unit tests are too chatty. BDD is too abstract.
TDD requires knowledge of implementation details. BDD does not care about implementation at all.
What is in the middle? Integration tests. Let's be Integration driven then! OK, then how to build infrastructure to run Integration tests? Should we start with IaaS first? How to speed up the development and take into account non-foundational requirements like scaling, security borders, isolation, etc. from the very beginning? To answer the questions, we would combine Integration test-based development with serverless (AWS) to solve a typical business task. Based on the example, we would show how to create a solid foundation for further refactoring/refining of the overall solution and concreting it with Unit tests.
Acceptance tests would be left for home exercise ;)

Natural Language Processing in .NET

Задачи по обработке естественного языка сейчас встречаются практически в любом проекте. К сожалению, до недавнего времени, платформа .NET не сильно подходила для решения подобных задач. С выходом ML.NET ситуация стала меняться к лучшему, но все еще далека от идеала.
На этом докладе я расскажу про основные задачи, которые решаются методами Natural Language Processing и какие существуют способы решения этих задач на платформе .NET (сервисы, библиотеки, фреймворки).

Power BI embedded

Quickly and easily provide customer-facing reports, dashboards, and analytics in your own applications by using and branding Power BI as your own. Reduce developer resources by automating the monitoring, management, and deployment of analytics, while getting full control of Power BI features and intelligent analytics.

Modeling Pub/Sub API system with F# and CQRS (on micro-scale)

Almost all of the APIs we build have a lot in common, but when you have to open several projects they are very different. Query and error handling, interaction with domain objects and infrastructure layers, etc. are different. All this only complicates the understanding of the components of the project and their interaction. In this talk, I will share how we build APIs that support different semantic models(Request/Response and Pub/Sub) and various protocols exchange (HTTP/WebSockets/AMQP). I will also try to unlock the potential of the CQRS architectural pattern and explain why we apply it to almost all API projects. And of course, I'll talk about the benefits and drawbacks of development in F #.
See you there!

Love, Death & F# Tests

.NET developers who want to learn some more programming techniques usually come to F# world. But then find it hard to use it in day-to-day work. I will show how you can utilize F# language without risks of putting something new and not-so-reliable directly to production.

Efficient Microservice Communication with .NET Core

The move to microservice infrastructure exposes new challenges, that are not typical for classic monolithic applications. Deployment, security, monitoring -- this list is far from complete.
In this talk Serhiy will speak about how to establish a fast and reliable communication channels between microservices. What patterns, protocols and data formats are available. How to enforce a backwards compatibility and strict contract between services and their clients. When we should use sync or async communication style, and so on.
Come to this session and hopefully you will come out with new ideas of how to build your stuff even better.

Dragons in a Mixed Reality World

In this session we'll demonstrate how to bring dragons or any other 3D model to life using Microsoft's Azure Spatial Anchors, HoloLens and mobile phones. You will learn what is augmented reality, we will introduce you Hololens, we will teach you what is Azure Spatial Anchor, how they work and how you can use them in your apps. This cross-device experience might be usable for all kind of applications.

Feature Toggles: Dynamic Configuration at Wirex

I will talk about the evolution of the feature toggles at the company and our experience with their use. We'll walk through their development step by step:
From a simple kill-switch in a configuration file to enable maintenance, which switches on/off access to services by all users. To the flexible set of rules with a granularity of priority from the country, state to the individual user.
From the direct database editing to the admin panel and automated changes depending on system events.
I'll also talk about actions - a combination of feature toggles and business logic rules for a dynamic customer interface based on the actions available to the user.