C# Arrays

Single and multi-dimensional arrays.

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int[] nums = { 3, 1, 2 }; or new int[5]
nums.Length, nums[0], nums[^1] (last element)
Array.Sort(), Array.Reverse(), Array.IndexOf()
Ranges: nums[1..3]
2D: int[,] grid = { {1, 2}, {3, 4} };

Key Takeaways: C# Arrays

Mastering C# Arrays helps you write clean and reliable C# code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.

C# Arrays Code Example

int[] marks = { 72, 95, 58, 88 };
Array.Sort(marks);

Console.WriteLine(string.Join(", ", marks));
Console.WriteLine($"Lowest {marks[0]}, highest {marks[^1]}");
Console.WriteLine(string.Join(", ", marks[1..3]));
Console.WriteLine(marks.Sum());

int[,] grid = { { 1, 2, 3 }, { 4, 5, 6 } };
Console.WriteLine(grid[1, 2]);

Output

58, 72, 88, 95
Lowest 58, highest 95
72, 88
313
6

Run this example on your own computer. The "Get Started" lesson shows how to set it up.

C# Arrays Practice Exercises

Check what you learned in “C# Arrays”.

/ 2 solved

Fill in the blank

Get the last element with the index-from-end operator.

int last = marks[  ];

✓ Correct! Not quite. Try again.

Multiple choice

Which method sorts an array in place?

Array.Sort() array.Order() Sort.Array() Array.Arrange()

✓ Correct! Not quite. Try again.

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C# Arrays

💡 Key Takeaways: C# Arrays

C# Arrays Code Example

C# Arrays Practice Exercises

Key Takeaways: C# Arrays