In this blog, we will learn to sort an array in C# without using an inbuilt C# function. We will learn ascending order and descending order array with a simple example.
Sort Array In C# Without Using Inbuilt Function
Example 1 - Sort an array in ascending order without using inbuilt C# function
We will create a simple one integer array having values 2,9,4,3,5,1,7 in the array as described in the following example. We will take two for loops; first, a for loop for checking the first position of an array and iterating the length of the array. The second loop starts with the i+1 position and iterates the length of the array.
  1. using System;
  3. namespace SortArrayExample
  4. {
  5. class Program
  6. {
  7. static void Main(string[] args)
  8. {
  9. int[] intArray = new int[] {2,9,4,3,5,1,7 };
  10. int temp = 0;
  12. for (int i = 0; i <= intArray.Length-1; i++)
  13. {
  14. for (int j = i+1; j < intArray.Length; j++)
  15. {
  16. if (intArray[i] > intArray[j])
  17. {
  18. temp = intArray[i];
  19. intArray[i] = intArray[j];
  20. intArray[j] = temp;
  21. }
  22. }
  23. }
  24. Console.WriteLine("Array sort in asscending order");
  25. foreach (var item in intArray)
  26. {
  27. Console.WriteLine(item);
  28. }
  29. Console.ReadLine();
  30. }
  31. }
  32. }
Output
Sort Array In C# Without Using Inbuilt Function
Example 2
Sort an array in descending order without using inbuilt C# function.
  1. using System;
  3. namespace SortArrayExample
  4. {
  5. class Program
  6. {
  7. static void Main(string[] args)
  8. {
  9. int[] intArray = new int[] {2,9,4,3,5,1,7 };
  10. int temp = 0;
  12. for (int i = 0; i <= intArray.Length-1; i++)
  13. {
  14. for (int j = i+1; j < intArray.Length; j++)
  15. {
  16. if (intArray[i] < intArray[j])
  17. {
  18. temp = intArray[i];
  19. intArray[i] = intArray[j];
  20. intArray[j] = temp;
  21. }
  22. }
  23. }
  24. Console.WriteLine("Array sort in descending order");
  25. foreach (var item in intArray)
  26. {
  27. Console.WriteLine(item);
  28. }
  29. Console.ReadLine();
  30. }
  31. }
  32. }
Output
Sort Array In C# Without Using Inbuilt Function
I hope you understand how to sort an array without using the inbuilt function.