Check out example codes for "selection sort c#". It will help you in understanding the concepts better.

Code Example 1

using System;
public class Example {
   static void Main(string[] args) {
      int[] arr = new int[10] { 56, 1, 99, 67, 89, 23, 44, 12, 78, 34 };
      int n = 10;
      Console.WriteLine("Selection sort");  
      Console.Write("Initial array is: ");
      for (int i = 0; i < n; i++) {
         Console.Write(arr[i] + " ");
      }
      int temp, smallest;
      for (int i = 0; i < n - 1; i++) {
         smallest = i;
         for (int j = i + 1; j < n; j++) {
            if (arr[j] < arr[smallest]) {
               smallest = j;
            }
         }
         temp = arr[smallest];
         arr[smallest] = arr[i];
         arr[i] = temp;
      }
      Console.WriteLine();
      Console.Write("Sorted array is: "); 
      for (int i = 0; i < n; i++) {
         Console.Write(arr[i] + " ");
      }
   }
}

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