Create a custom captcha provider with ASP.NET Core
Nowadays, you can't actually run a website on the Internet without having a protection mechanism against content bots. One possibility is the use of
New Format Options of System.Text.Json with .NET 9
With .NET 9, Microsoft has added new options to the System.Text.Json library to format the output of JSON objects - features that, in my opinion, sho
Compile your .NET projects with multiple SDKs on GitHub
The recommended variant for specifying the SDK in .NET is the global.json file. This centrally guarantees that all computers on which the code is com
When to use records in C#
For several years now, C# has supported Records as a new "type". Initially only for classes (which is why the class is optional for a recor
Create an anti-idle App for Microsoft Teams with .NET
Anti-idle apps for Microsoft Teams and the like are a dime a dozen, but how about creating your own? In this article, I'll show you how to create an
Create QRCodes with .NET and ZXing
QR Codes are a very popular way to pass on information - for example an URL. The QR code can be placed on all kinds of places, for example in parking
Create an Entra Local User Account via Microsoft Graph with .NET
The Microsoft Graph and Entra documentation are both very comprehensive and provide a lot of information - but they often contain no examples or no w
The power of Aggressive Inlining in .NET and C#
If you browse through certain libraries or the .NET Runtime from time to time, you will notice that the attribute MethodImplOptions.AggressiveInlinin
Replace FluentAssertions with AI
New year - new .NET drama. You would have thought that positive lessons had been learned from the last Moq drama; but we were proven wrong. What happ
Advanced Usage of MSSQL Indexed Views in EF Core
In the world of Microsoft SQL Server, views are a powerful tool for simplifying complex data queries. Simple views offer no real performance gain but
Increase Command Timeout for EF Core Migration Bundles
EF Core Migration Bundles are standalone executable files that contain one or more Entity Framework Core migrations and can be applied directly to a
Create a custom proxy endpoint action with ASP.NET Core MVC
There are various reasons why it is useful to channel certain requests through your own application to an external endpoint; the most obvious is, for
Load Google Search Crawler IP Address Ranges with Refit
Rate Limit is a great tool to protect your own website and content from misuse; in some cases, however, rate limiting is also bad: for example, if yo
Replace and remove whitespaces in strings - performant and sustainable
There are many ways to remove spaces or other characters in a string - there are just very big differences in terms of performance and efficiency. Be
Auto Format your Code on save with Visual Studio
Code formatting is a very important element when developers work together on a project - and you are always well advised not to invent your own forma
Sustainable Code with .NET 9
Sustainable Code is a constantly growing GitHub repository created by me, in which I collect various everyday code snippets and measure the performan
Use ServiceCollection in Unit Tests with .NET
A popular unit test - and also a necessary test - is the correct registration of interfaces and their implementation with dependency injection. And a
How to process ZIP Files from a Stream in .NET
When working with ZIP files in .NET, there may be cases where the file is not stored on disk but comes directly as a Stream. This could happen if you
Decompress a ZIP archive with .NET
Working with compressed files is common in many applications, whether you're extracting data from an archive, installing software packages, or retrie
Compress a folder of files to a ZIP archive with .NET
When working with .NET apps you may sometimes need to bundle multiple files into a single compressed archive for easier storage, transfer, or process
Read cpu load on Windows with .NET
In C# (.NET 6 and above), there is now a very simple way to read out the CPU load with minimal overhead - i.e. without threads. The PerformanceCounte
.NET: the cost of returning an empty collection
Dealing with empty lists is an everyday situation in .NET. An empty list is often preferred to a null in order to control the logic. But how expensiv
.NET: use a preview version in your global.json
We are currently in the preview phase of .NET 9, which releases in Nov 2024 - and if you want to test it extensively like I do, store the preview ver
Efficiently clean a string with .NET
Strings are one of the most commonly used types in .NET applications - and very often the source of inefficient code. For example, cleaning up a stri
Refit .NET - my personal caller best practise
Refit is an open-source library for .NET developers that simplifies the process of making HTTP API calls. It allows developers to define a set of int
Strong Name Sign .NET Assemblies via SNK
Strong Name Signing is a mechanism in .NET development that ensures the integrity and authenticity of assemblies. It is based on a public-private key
Handle Yaml Files with .NET
YAML files are unfortunately part of everyday life for all developers these days; and although they are very error-prone and almost impossible to edi
ASP.NET Core Form protection with Cloudflare's Turnstile
TLDR; You can see the full sample in my GitHub repository BEN ABT Samples - ASP.NET Core Form protection with Cloudflare's Turnstile Turnstile is a
Use GitHub Copilot Chat in Visual Studio to solve the .NET Moq drama and migrate to NSubstitute
It's now been a few months since the GDPR-drama and data-harvesting around Moq (Stop using Moq as a guinea pig to get feedback on and develop Sponsor
.NET Event Counters
.NET event counters are a relatively new API for collecting metrics from .NET applications. They are part of the EventSource and EventCounter namespa
Custom Azure Application Insights Telemetry Metrics with .NET
By default, Azure Application Insights comes with necessary and important telemetry capabilities to monitor the basic functions of an application and
Azure Communication Service - .NET Client with Managed Identity
The Azure Communication Service is a fairly new but already popular service for sending emails at scale. In this article, I would like to show you ho
Azure Communication Service - .NET Client with ConnectionString
The Azure Communication Service is a fairly new but already popular service for sending emails at scale. In this article, I would like to show you ho
Header and Footer Layouts with Handlebars.NET
One of the last blog posts (Text and EMail Templates with Handlebars.NET) was generally about HandleBars.NET - a very popular template engine. This p
.NET Naming Best Practises: API Models
API models are one of the elements where I personally see the most naming errors - which have a massive impact on the architect and cause subsequent
.NET Naming Best Practises: Services vs. Providers
In many code bases there are Services and Providers - and often they do the same thing structurally; but what is the idea of a Service- and Provider-
.NET Naming Best Practises: Database Entities
Database entities are the objects that represent the tables in your database. They are the objects that you use to read and write the database. Namin
.NET Naming Best Practises: DTOs
Often seen, often used incorrectly: DTOs. Data Transfer Objects. In principle, DTO is an umbrella term, a design pattern that is used to transfer dat
Text and EMail Templates with Handlebars.NET
A frequent requirement in apps is the conversion of templates, e.g. for sending e-mails, for PDF templates or other text modules. There are many diff
Create QR Codes with .NET
QR codes are a simple and very popular way of exchanging data and information - even in .NET. They have become part of everyday life. Unfortunately,
Deploy ASP.NET Core via Zip Deployment to Azure Web App
There are various ways to deploy an application, but Zip deployment is the variant that is recommended the most - regardless of whether you are using
New Data Annotation attributes with .NET 8
With .NET 8, the System.ComponentModel.DataAnnotations Namespace has been revised and some new attributes have been added that have been requested by
The well-structured Entity in EF Core
A database entity represents an identifiable entry, often also things from the real world, which are to be stored and managed in the database. The pu
When to use optional arguments and parameter defaults in c#
In C#, optional arguments are parameters in a method that have default values specified in the method's declaration. This means that when you call th
.NET 8 makes you faster. Everyday.
As has been the case for many releases, the .NET 8 team is spending a lot of development effort to improve the .NET Runtime in terms of performance.
Convert UnixTime to DateTimeOffset with a custom System.Text.Json Converter
Some APIs do not follow standards, ignore ISO8601 and return UnixTime. This is not nice, but can be easily fixed with a custom converter for System.T
Accelerate your .NET build with Visual Studio 2022
A little more than three months ago, Microsoft integrated a new functionality into Visual Studio 2022: Build Acceleration. This mechanism, which can
Re-use EF Core Expressions to avoid redundant queries
I often see snippets in EF Core code reviews such as the following: dbContext.Users.Where( user => user.Id == id ); The query filter user => u
Easy InMemory Unit Tests with EFCore and Sqlite
Unit testing is a type of software testing that is performed on the smallest unit of a software application, called a "unit". A unit can be
Better Code with custom Strong-Id Types
In many software architectures the problem exists that there are methods, which are specified a multiplicity of type-same parameters, whose meaning i
Microsoft has moved Teams backend service to .NET 6 - the performance results
September last year, Microsoft announced that a large number of backend services would be migrated to .NET 6. This, they said, was an enterprise-wide
A struct with an interface is inefficient in .NET
Structs have their advantages in .NET: they are especially efficient in the runtime if used correctly. But if you use structs with an interface, the
Difference of is null vs equals null and why is null is recommended
Both C# is null and == null are used to check if a variable or object is null, but they work slightly differently. is null checks if the variable or
Create Symbolic Links on Windows with .NET
Symbolic Links (often abbreviated as symlinks) are a type of file or folder shortcut in Windows that reference another file or folder in the file sys
Benefits of using isolated mode of Azure Functions with .NET
The isolated mode of Azure Functions with .NET allows for greater control over the runtime environment and dependencies of the function. In this mode
Statische Methoden in C# / .NET
Statische Methoden in C# sind Methoden, die auf eine Klasse und nicht auf eine bestimmte Instanz einer Klasse angewendet werden. Sie können aufgerufe
Compile Linq Expressions to increase performance
Expressions are now an absolute part of a developer's everyday life in .NET thanks to Linq. However, due to their nature, expressions are not one of
DateTime vs. DateTimeOffset - UtcNow vs. Now
.NET has two principal ways for handling times: DateTime and DateTimeOffset. The big deficit of DateTime, which was also recognized early in .NET 1.0
Microsoft is moving backend services to .NET 6
Microsoft has announced in an impressive blog post on the .NET DevBlogs that they have started an enterprise-wide migration to migrate backend servic
Why you should no longer use var in C#
Beginning with C# 3, variables that are declared at method scope can have an implicit "type" var. An implicitly typed local variable is st
Azure IoT: send messages with C#
Requirements You must have created an IoT Hub in Azure. You must have created a device in your created Azure IoT Hub. You need the connection string
Fast SQL-Insert with C# and SqlBulkCopy
In .NET, there is a very fast and easy way to pump a variety of entities into an SQL database: SqlBulkCopy public void BulkInsert<TEntity>(stri
Load an image into a byte-array with C#
This pretty simply snippet exports your Image into a byte-array. public static byte[] ToByteArray(this System.Drawing.Image image) { using(Memory
Download a file with .NET
The most current and currently recommended way to download .NET Framework, .NET Standard or .NET Core files from the Internet is the HttpClient class
Einfaches WCF-Beispiel ohne komplizierte Config
Unter anderem durch die Aktivität im myCSharp.de-Forum ist mir aufgefallen, dass viele Entwickler doch Probleme mit der Konfiguration von WCF-Dienste
Unit-Testen von internen Klassen in C#
Die Zeit am Flughafen möchte ich dazu nutzen einer meiner Anfragen per E-Mail zu beantworten. Hallo Benjamin, wie testest du Quellcode, der mit inte
C# - Eigene Events - Beispiel anhand einer E-Mail-Überwachung
Dieser Codeschnippsel soll exemplarisch zeigen, wie man in C# eigene Events definiert. Als Beispiel dient hier die Überwachung von E-Mails in der Kon
C# Warteschlangen – Die BlockingCollection
Oft werden Warteschlangen benötigt, um Aufgaben zu Verwalten oder durch etwaige Parallelität die Performance zu Steigern. Mit .NET 4.0 hat Microsoft
Magic Strings in C# vermeiden
Ich wurde schon öfter im Zusammenhang gefragt (insbesondere im Forum myCSharp.de), wie ich sogenannte Magic Strings vermeide. Was ist ein Magic Strin