Posts on CSharp Concepts and Features

THE CRUX: record types are meant for storing read-only, init-once data. They serve the purpose of ValueTypes, but in reality they are reference type . . .

Following are my top 6 interview questions on the "init" accessor introduced recently in C# 9. The answers have all been fully explained t . . .

Following are some of the reasons that you can consider when deciding on learning ASP.NET Core. I think .NET Core has a good future and in the comin . . .

If you already know of the Task type, and have now happened to meet a similar looking ValueTask, then you are likely interested in knowing more abou . . .

If a function consists of only one statement or expression, then the braces and the return keyword could be redundant. Thus, we can simplify such fu . . .

An object reference might be null when your code calls a function or accesses a property. Programmers use an if-condition as a safety net and make a . . .

Main method is the equivalent of the main method as we know in C language. It's the entry point of your program which means that it is the first . . .

The concept of a property is the most widely used in dotnet programming. Properties provide setter and getter functions for validation of data befor . . .

Value Types and Reference types are two types in C#. If you are familiar with C and C++, then you can think of reference types as that hold address . . .

An anonymous type is described by a comma separated properties clubbed into curly braces. The properties are readonly. The corresponding data-type i . . .

Functions in C# are usually called Methods. They can exist inside a class, struct, record - but not globally outside. So every function, including t . . .

In this tutorial we learn about delegates that are a data-type for a function signature. In this context a function signature includes the return ty . . .

Inheritance in C# is similar to what we have in other object oriented languages. In this tutorial we take a short example to get introduced to the s . . .

This tutorial is for explaining a few programs that exhibit the idea of polymorphism. I won't be able to go into the philosophy of polymorphism. . . .

A static class is a container for self-contained static functions that just operate on the input operators. The concept of a static class and static . . .

Only one copy of a static data member exists in the entire program. A const member behaves like a static, but it's value is marked as fixed and . . .

An interface is a collection of related functionality. An audio player is an audio player only if it implements the ability to play, pause, stop, et . . .

In this tutorial we take a hypothetical problem to build towards the concept of generics. First we explore a few bad solutions. Then we explain a pe . . .

We expect you have a very general understanding of object oriented programming blocks like classes and structs. In this tutorial we have a quick loo . . .

Write a C# class called CData to hold a float type of quantity. This class also contains an enumeration of two members - Meter and Centimeter - to s . . .

This exercise is an exercise just for the sake of practice in static and consts in a class. Create a class called CBankAccount that contains a stati . . .

Create a class MyClock that contains only one public function "void Tick(Object?)". This signature matches the signature of the TimerCallb . . .

Create a class called MyNumber with a property called Number of Int32 type. This class should contain an event delegate that takes one argument of I . . .

We have to store four properties of a record - student id of string type and marks in three subjects of Int32 type. Inside main create an array of 1 . . .

This tutorial introduces you to the IEnumerable interface and its practical significance. After that we discuss the internal workings of this interf . . .

In this tutorial we learn the use of Select, Where, OrderBy and OrderByDescending functions provided by C# LINQ. A program has been used to explain . . .

In this tutorial we learn about FirstOrDefault, Single, First and SingleOrDefault extension methods available on an IEnumerable. Use FirstOrDefault . . .

C# Linq provides a GroupBy extension method for grouping records on a common key. This tutorial starts with a brief introduction to the concept of g . . .

Two lists can be joined on common key or keys by using the Join extension method. The concept of a join in linq is exactly the same as in SQL of dat . . .

Database connectivity is required in almost every project. It is best done with the help of EF Core libraries. The good thing is that the steps for . . .

Create a list of Category records with ID and Name as properties. Add 3 items to this list - (ID:1, Name:"For Men"), (2, "For Women&q . . .

This tutorial continues from the previous tutorial where we created a database and a table in it. We shall now add a blog record to the table and sa . . .

Discards are denoted by an underscore. They can be thought of identifiers that receive an assignment, but the assignment is discarded and not availa . . .

Pattern matching is used to test an expression. In this tutorial we take various snippets to learn expression matching. One of the uses is to test i . . .

In this tutorial we take common topics on strings, such as creating strings, on concatenation of strings, extraction of a substring, and truncation, . . .

Suppose there is a string s = "aubcd123paqeaw". Write three programs (1) Write a program to count the number of 'a' in this string . . .

The concept of statements and expressions in C# is exactly the same as in other programming languages. So, this tutorial is a review for the sake of . . .

Array can be used to store many variables of the same type. An array can be of one dimension, can be of multiple dimensions and can even be a jagged . . .

A collection class holds objects. We have seen that arrays also hold objects. The size of an array is fixed at the time of creation, but collections . . .

Reflection is used to obtain information about the functions, properties, events, fields of a given Type of dotnet. For example, we can use reflecti . . .

An application is often required to make database access, perform file read and write or contact internet for communication. All these tasks involve . . .

A function throws an exception on failure. The functions that are expected to fail are written inside try blocks with one or more catch blocks. Each . . .

A text file contains an unknown number of records. Each record is of the format ABCD,N where ABCD is the code of a supplier and N is a sequence of d . . .

This project creates an HTTP Server on a Windows PC. The server presents an html page to a connecting client. The page contains html and javascript . . .

This is the first step of writing the code for the classroom voting application. In this tutorial we shall add a model class to hold voting data. We . . .

This is the second step of writing our project on classroom voting application. We shall now set an http listener to listen and respond to requests . . .

Pay $10 and get all the following C# .NET Core Projects with Source Code. Code has been written with new C# features and syntax. Master the art of b . . .

Functions in C# are usually called Methods. They can exist inside a class, struct, record - but not globally outside. So every function, including t . . .