C# Demo Examples

Practice programs, one file each. Open a file in the code viewer, download it, modify it, and run it with dotnet run. Organized by lesson category.

How to use: click View to open a file in the code viewer, read its comments, download it, and run it in your own project with dotnet run. Each file is self-sufficient — no hidden dependencies.

Foundations

Syntax, variables, operators, control flow, loops, and methods.

#	Description	Link
1	Hello, World	View
2	Variables & Types	View
3	Operators	View
4	Control Flow	View
5	Loops	View
6	Methods	View

Composite & Collections

Structs, classes, records, arrays, and generic collections.

#	Description	Link
7	Struct	View
8	Class	View
9	Record	View
10	Arrays	View
11	List<T>	View
12	Dictionary	View

I/O & Files

Console interaction and text file handling.

#	Description	Link
13	Console I/O	View
14	Files	View

Reliability

Error handling, casting, and strings.

#	Description	Link
15	Error Handling	View
16	String Functions	View