IT Courses

Write and run your first C# console program. This lesson includes the commands, complete code, expected output, and fixes for common beginner errors. Before you start Install the .NET SDK from Microsoft's official website. An editor alone cannot compile C#. Open a terminal and run dotnet --version . A version number confirms that the command is available. Create a console project dotnet new console -n HelloCourse cd HelloCourse dotnet run The template creates a project file and Program.cs. Run the commands one line at a time. The final command builds and runs the project in the current directory. A complete program with Main Replace the contents of Program.cs with this code. Use this version if your course explains classes and the Main entry point. using System; class Program { static void Main() { Console.WriteLine("Hello, World!"); } } Save the file and run dotnet run again. Expected output: Hello, World! using System lets us use Console without w...

A C# method groups statements under a name so you can call them again. This lesson builds a console program that displays two course messages and calculates a total. Start with our C# Hello World setup guide if you have not created a console project. Complete method-calling example Replace Program.cs in a console project with the code below, save it, and run dotnet run from the project directory. using System; class Program { static void Main() { ShowMessage("Welcome to C#"); ShowMessage("Practice one method at a time"); int total = AddLessons(3, 2); Console.WriteLine($"Total lessons: {total}"); } static void ShowMessage(string message) { Console.WriteLine(message); } static int AddLessons(int completed, int planned) { return completed + planned; } } Expected output Welcome to C# Practice one method at a time Total lessons: 5 Main runs first. It calls ShowMessage with ...