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EF Core Migrations is a feature that helps manage database schema changes. It allows developers to easily create, update, and rollback database migrations using a code-first approach, ensuring that your database schema stays in sync with your application models.

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This set outlines how to construct a filter for the User Object Filter and Group Object Filter attributes in an LDAP configuration.

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This means: search for all entries that have objectClass=user AND cn that start with the word 'Mark'.

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A C# method can be called with invalid arguments, this may cause an ArgumentException.

ArgumentException indicates that a method was called with an invalid argument. This can help improve program quality.

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ArgumentException is thrown when a method is invoked and at least one of the passed arguments does not meet the parameter specification of the called method. The ParamName property identifies the invalid argument.

When using the ArgumentNullException constructor, you can pass a string literal indicating the null argument.

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The time service in Windows can be reset to a default state by running the following inside an elevated Command Prompt (CMD):

net stop w32time
w32tm /unregister
w32tm /register
net start w32time

To verify the time server, follow these steps:

  • Run timedate.cpl
  • Position to the "Internet Time" tab
  • Click "Change settings…" and verify the time server (like
  • Ensure that "Synchronize with an Internet time server" is checked
  • Click on "Update Now" and click OK to save the changes.
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Scrum is an empirical process control framework.

Empirical means to runs experiments to improve the product.

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Meetings in Scrum

  • Sprint Planning
  • Sprint Daily Sync
  • Sprint Review
  • Sprint Retrospective

Additional meetings

  • Sprint Review Preparation
  • Sprint Review Demo Preparation
  • Sprint Review Dry Run
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You can use the following code snippets to get a class's public methods using reflection. The class name is provided as typeName.

MethodInfo[] methodInfos = typeof(Class).GetMethods();

Variant with filter using BindingFlags

MethodInfo[] methodInfos = Type.GetType(typeName) 
                           .GetMethods(BindingFlags.Public | BindingFlags.Instance);
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You can use this code to get only the methods decorated with a custom attribute.

MethodInfo[] methodInfos = assembly.GetTypes()
                      .SelectMany(t => t.GetMethods())
                      .Where(m => m.GetCustomAttributes(typeof(CustomAttribute), false).Length > 0)
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Here’s an example of how to invoke a private method using reflection in .NET:

MyClass myClass = new MyClass();
Type classType = myClass.GetType();
MethodInfo methodInfo = classType.GetMethod("MethodName",
                BindingFlags.Instance | BindingFlags.NonPublic);
// Make an invocation:
var result = await (dynamic)methodInfo.Invoke(myClass, null);
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Sometimes, we want to change an HTML5 input’s placeholder color with CSS.

To change an HTML5 input’s placeholder color with CSS, we use the ::placeholder selector.

For instance, to set the input placeholder’s color to #909 we write:

::placeholder {
  color: #909;
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HTTP response status codes indicate whether a specific HTTP request has been successfully completed.

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The HTTP PUT request method creates a new resource or replaces a representation of the target resource with the request payload.

The difference between PUT and POST is that PUT is idempotent: calling it once or several times successively has the same effect (that is, no side effect), whereas successive identical POST requests may have additional effects, akin to placing an order several times.

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It is possible to use PUT without a body like

PUT /example HTTP/1.0
Content-Type: text/plain
Content-Length: 0

A sample would be the github starring API, which uses PUT with an empty body to turn on a star and DELETE to turn off a star.

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You can get private property like so:

Class class = new Class();
var privateProperty = class.GetType().GetProperty("privateProperty", BindingFlags.Instance | BindingFlags.NonPublic);
int propertyValue = (int) privateProperty.GetValue(class);

var privateField = class.GetType().GetField("privateField", BindingFlags.Instance | BindingFlags.NonPublic);
int fieldValue = (int) privateField.GetValue(class);
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Entity Framework Core 5 is the first EF version to support filtering in Include.

Supported operations are Where, OrderBy(Descending)/ThenBy(Descending), Skip, Take

Some usage example

    .Include(c => c.Orders.Where(o => o.Name != "Foo")).ThenInclude(o => o.OrderDetails)
    .Include(c => c.Orders).ThenInclude(o => o.Customer)

Only one filter is allowed per navigation, so for cases where the same navigation needs to be included multiple times (e.g. multiple ThenInclude on the same navigation) apply the filter only once, or apply exactly the same filter for that navigation.

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In the example below, we have a list of numbers. The ForEach method is called on the list and a lambda expression num => Console.WriteLine(num) is passed as the argument. This lambda expression takes each element num from the list and prints it using Console.WriteLine. The lambda acts as the action to be performed on each element in the list.

var numbers = new List<int> { 1, 2, 3, 4, 5 };
numbers.ForEach(num => Console.WriteLine(num));
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The spread (...) syntax allows an iterable, such as an array or string, to be expanded in places where zero or more arguments (for function calls) or elements (for array literals) are expected.

Spread operator doing concat

let arrayOne = [1, 2, 3];
let arraryTwo = [4, 5];
arrayCombined = [...arrayOne,...arrayTwo];

Add item using spread operator

let arrayOne = [1, 2, 3];
arrayNew = [...arrayOne, 3];

Spread syntax (...) - JavaScript | MDN (

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This is an elementary guide to Git for beginners. Git is a version-control system for tracking changes in files associated with projects of different types. It is primarily used for source-code management in software development, but it can be used to keep track of changes in any set of files.

Without a version control system, you probably used to frequently save copies of your work-in-progress in zip files. But when you feel that your work is a mess and you need to get back to a previous version of some files, how to deal with mixed changes in files? It’s a real pain to do that. Git and other version control systems like SVN are a great solution.

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C# expression operators are fundamental tools for performing computations and evaluating conditions in code.

  • Arithmetic operators (+, -, *, /, %) allow you to perform addition, subtraction, multiplication, division, and modulo operations on numeric values.
  • Comparison operators (==, !=, <, >, <=, >=) are used to compare values and determine relationships, such as equality or order.
  • Logical operators (&&, ||, !) evaluate boolean expressions and help combine conditions to make decisions or control program flow.
  • The conditional operator (?:) allows for concise conditional expressions, making it easier to handle branching logic based on a condition.
  • Assignment operators (=, +=, -=, etc.) assign values to variables or update them by performing an operation.
  • Bitwise operators (&, |, ^, <<, >>) operate on individual bits of numeric values, enabling low-level manipulation and optimization.
  • The null-coalescing operator (??) concisely handles null values, allowing for fallback or default values when encountering null references.

By understanding and utilizing these operators, you gain powerful tools to perform calculations, make decisions, and control the behavior of your C# programs.

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C# Lambda expression operator (=>) is a shorthand syntax for defining anonymous functions. It allows you to write compact and inline functions without the need to declare a separate method. Lambdas are commonly used in LINQ queries, event handlers, and functional programming. They improve code readability, enable concise operations on collections, and provide a flexible way to work with data and delegates.

In lambda expressions, the lambda operator => separates the input parameters on the left side from the lambda body on the right side.

Here's an example that calculates the square of each number in a list:

List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };
List<int> squaredNumbers = numbers.Select(x => x * x).ToList();
// squaredNumbers will be [1, 4, 9, 16, 25]

In this code, we have a list of numbers. Using the Select method and a Lambda expression x => x * x, we square each number in the list. The Lambda expression takes an input x and returns its square x * x. Finally, we have a new list squaredNumbers containing the squared values of the original numbers. Lambda expressions are versatile and enable concise operations on collections, making code more expressive and readable.

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To align content like buttons to the right you can use CSS flexible box layout.

<div class='align-right'>
   <button type='submit'>Create</button>

The CSS to align the buttons on the right uses two properties.

.align-right {
  display: flex;
  justify-content: flex-end;


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To do a case-sensitive search in EF Core you can use an explicit collation in a query like

var customers = context.Customers
.Where(c => EF.Functions.Collate(c.Name, "SQL_Latin1_General_CP1_CS_AS") == "John")

Note: EF Core does not support operators on in-memory collections other than simple Contains with primitive values.



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A callback is a function passed as an argument to another function. This technique allows a function to call another function. A callback function can run after another function has finished.


Using a callback, you could call the calculator function (myCalculator) with a callback (myCallback), and let the calculator function run the callback after the calculation is finished:

function myDisplayer(some) {
  document.getElementById("demo").innerHTML = some;

function myCalculator(num1, num2, myCallback) {
  let sum = num1 + num2;

myCalculator(5, 5, myDisplayer);

In the example above, myDisplayer is a called a callback function.

It is passed to myCalculator() as an argument.


When you pass a function as an argument, remember not to use parenthesis.

Right: myCalculator(5, 5, myDisplayer);

Wrong: myCalculator(5, 5, myDisplayer());

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Question: How can I check if a string is empty?

Option 1: Check using ""

if (str === "") {

Note: to know if it's an empty string use === instead of ==. This is because === will only return true if the values on both sides are of the same type, in this case a string. for example: (false == "") will return true, and (false === "") will return false.

Option 2: Check length of string

if (!str || str.trim().length === 0) {
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Question: How do you convert a nullable bool? to a bool in C#?


You can use the null-coalescing operator: x ?? something, where something is a boolean value you want to use if x is null.


bool? nullBool = null;
bool convertedBool = nullBool ?? false; // convertedBool will be false

The null-coalescing operator ?? returns the value of its left-hand operand if it isn't null; otherwise, it evaluates the right-hand operand and returns its result. 

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  • Managed Identities
    • User Assigned Managed Identities (UAMI)
  • Service Principals
  • Service Connections


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Azure Key Vault is a cloud-based secrets store for holding app secrets, including configuration values like passwords and connection strings that must always remain secure. It keeps secrets in a single central location and provides secure access, permissions control, and access logging.

Use Azure Key Vault to store secrets like Passwords, Shared Access Signature (SAS) tokens, Application Programming Interface (API) keys, and Personal Access Tokens (PAT).

...see more

The definition of the CSS class

   animation: rotation infinite 3s linear;

Here we added an animation property with a value rotation infinite 3s linear, which is.

  • rotation: this is the name of the animation.
  • infinite: the animation should play infinitely.
  • 3s: animation duration.
  • linear: play the animation at the same speed from start to end.

Source: How to rotate an image continuously in CSS | Reactgo

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