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LINQ, or Language Integrated Query, is a query language in the .NET Framework. LINQ is useful in that you could have several different data sources you are working with within Visual Studio, and LINQ provides a way to query data uniformly. Examples include SQL, Objects, ADO.NET, Entity Framework etc. Here we will go through examples of using LINQ. Firstly, to use LINQ, you add the namespace: using System.Linq; Let’s say … Continue reading Linq and Lambda in C#

Anonymous functions in C# are basically functions without a name that can be used in different situations. Let’s take a look at some examples. When looking at delegates, we saw how to pass delegate functions as parameters. With anonymous functions, we can define the delegate and then pass an anonymous function to it. In the example below, we are creating a delegate and then creating the anonymous function code, then … Continue reading Anonymous Functions in C#

Delegates in C# hold a reference to a method. If you think about writing methods, you may generally send parameters such as objects/type variables to the method. At times, you may want to send an actual method as a parameter to another method. Delegates are like a placeholder for methods. Let’s go through an example. Let’s say we have a list of customers that are based on different cities. Customer c1 … Continue reading C# Delegates

Generics in the .NET Framwork allow you to work with generic types without having to specify a data type until the class is instantiated. Generics are useful, in that you may have a class that you don’t want to limit the functionality to a certain data type. For example, you may have a class that can compare 2 integers, or it could also compare 2 strings. Instead of creating 2 … Continue reading Generics and T in C#

The .NET Framework contains different types of collections that can be used to store and retrieve data. In this post we will look at the different types. Collections consist of: Queue Stack ArrayList List LinkedList Dictionary Each collection type has different benefits. Collections in the .NET Framework are in: System.Collections System.Collections.Generic Queue A queue is a FIFO (first in first out) list. You can think of this as like a … Continue reading Collections in C#

The purpose of Interfaces in C# is to define a contract. Any class that then implements the interface will know which methods it needs to have. An interface is like an abstract class, but without any implementation. Let’s look at an example. Let’s say we have a Vehicle interface, like below. A Vehicle will have wheels. If this were an abstract class, we could define the implementation of HowManyWheels, for … Continue reading C# Interfaces