C# (pronounced “C sharp”) is Microsoft’s free, general-purpose programming language for building web apps, APIs, cloud services, desktop apps and Unity games. You write C#, and the .NET platform compiles and runs it on Windows, macOS and Linux. In this tutorial, I’ll explain what is C# in plain English, then have you write and run … Read more >>

Two classes called Order, one for billing and one for shipping, and the compiler needs to know which one you mean. That’s the whole reason namespaces exist. Quick answer: A namespace in C# is a named scope that groups related types and keeps their names unique. Declare it with namespace Lakeview.Store.Billing; and import it elsewhere … Read more >>

Our Seattle warehouse team wanted an audit line for every order and an email when a standing desk drops below five units. Events in C# handle that cleanly: the order code announces what happened and never needs to know who’s listening. In this tutorial, I’ll build that order service step by step and show you … Read more >>

Prices that print as 25 instead of 25.00 look broken to anyone reading a receipt. The fix for C# 2 decimal places is short: convert the int to a double and call ToString(“F2”), or round the value with Math.Round(value, 2). In this tutorial, I’ll show you every way I handle C# 2 decimal places in … Read more >>

Payroll code is where I see inheritance used well and abused most. Inheritance in C# lets a derived class reuse and extend a base class: write class Employee : Person, and every Employee gets the members of Person plus its own. In this tutorial, I’ll map out how inheritance in C# really behaves on .NET … Read more >>

Sooner or later you’re branching on one value with five possible answers. A switch case in C# matches that value against case labels and runs the first section that fits, which reads far better than a stack of else if lines. In this tutorial, I’ll cover the switch case in C# as I use it … Read more >>

A client’s Customer class had grown to 1,400 lines, and half of it was code a tool had generated. Every regeneration wiped out somebody’s hand-written fix. In this tutorial, I’ll show you how a partial class in C# fixes that, using real .NET 10 runs: the syntax across two files, the rules, partial methods, partial … Read more >>

Status code 3 means nothing to whoever reads your code next year. Shipped means everything, and the compiler can check it for you. Quick answer: An enum in C# is a value type that gives names to a fixed set of integer constants. Declare it with enum OrderStatus { Pending, Paid, Shipped }, cast it … Read more >>

Dispatch software for a Texas freight client starts every morning with zero orders and ends with a few hundred. Nobody knows the final number in advance, so a fixed-size C# array is the wrong container for that list. In this tutorial, I’ll walk through List in C# the way I use it on .NET 10: … Read more >>

Want C# to create a folder only if it doesn’t exist? Call Directory.CreateDirectory(path). It creates the folder when it’s missing and quietly returns the existing one when it’s already there, so no check is needed. In this tutorial, I’ll cover every C# create folder if not exists case I run into: the current directory, folders … Read more >>