C# bubble sort,selection sort,insertion sort

static void Main(string[] args)             {                 InsertionSortDemo();                 Console.ReadLine();             }        static void InsertionSortDemo()             {                 Random rnd = new Random();            int[] arr = new int[100];            for (int i = 0; i < 100; i++)                 {                     arr[i] = rnd.Next(0, 1000);                 }                 Console.WriteLine("Raw data:");            foreach (var a in arr)                 {                     Console.Write(a + "\t");                 }                 InsertionSort(arr);                 Console.WriteLine("\n\n\nAfter insertion sort:");            foreach(var a in arr)                 {                     Console.Write(a + "\t");                 }             }        static void InsertionSort(int[] arr)             {            int inner, temp;            for (int outer = 0; outer < arr.Length; outer++)                 {                     temp = arr[outer];                     inner = outer;                while (inner > 0 && arr[inner - 1] >= temp)                     {                         arr[inner] = arr[inner - 1];                         inner--;                     }                     arr[inner] = temp;                 }             }        static void SelectSortDemo()             {                 Random rnd = new Random();            int[] arr = new int[100];            for (int i = 0; i < 100; i++)                 {                     arr[i] = rnd.Next(0, 10000);                 }                 Console.WriteLine("Raw data:");            foreach (var a in arr)                 {                     Console.Write(a + "\t");                 }                 SelectionSort(arr);                 Console.WriteLine("\n\n\nAfter selection sort:");            foreach(var a in arr)                 {                     Console.Write(a + "\t");                 }             }        public void SelectSort(int[] arr)             {            int min;            for(int outer=0;outer<=arr.Length;outer++)                 {                     min = outer;                for(int inner=outer+1;inner<=arr.Length;inner++)                     {                    if(arr[inner]<arr[min])                         {                             min = inner;                         }                     }                if(min!=outer)                     {                    int temp = arr[min];                         arr[min] = arr[outer];                         arr[outer] = temp;                     }                 }             }        static void SelectionSortDemo()             {                 Random rnd = new Random();            int[] arr = new int[100];            for (int i = 0; i < 100; i++)                 {                     arr[i] = rnd.Next(0, 1000);                 }                 Console.WriteLine("Raw data:");            foreach (var a in arr)                 {                     Console.Write(a + "\t");                 }            int[] selectionArr = SelectionSort(arr);                 Console.WriteLine("\n\nSelection sort:");            foreach(var a in selectionArr)                 {                     Console.Write(a + "\t");                 }             }        static int[] SelectionSort(int[] arr)             {                              int min = 0;            for(int i=0;i<arr.Length-1;i++)                 {                     min = i;                for(int j=i+1;j<arr.Length;j++)                     {                    if(arr[j]<arr[min])                         {                             min = j;                         }                     }                if (i != min)                     {                    int temp = arr[i];                         arr[i] = arr[min];                         arr[min] = temp;                     }                 }            return arr;             }        static void BubbleDemo()             {                 Random rnd = new Random();            int[] arr = new int[100];            for(int i=0;i<100;i++)                 {                     arr[i] = rnd.Next(0, 1000);                 }                 Console.WriteLine("Raw data:");            foreach(var a in arr)                 {                     Console.Write(a + "\t");                 }            int[] ascArr = BubbleSort(arr, true);                 Console.WriteLine("\n\n\nAsc order:");            foreach(var a in ascArr)                 {                     Console.Write(a + "\t");                 }            int[] descArr = BubbleSort(arr, false);                 Console.WriteLine("\n\n\nDesc order:");            foreach(var a in descArr)                 {                     Console.Write(a + "\t");                 }             }        static int[] BubbleSort(int[] arr,bool isAsc)             {            if(arr==null && arr.Length==0)                 {                return null;                 }                              for(int i=0;i<arr.Length;i++)                 {                for(int j=i+1;j<arr.Length;j++)                     {                    //Ascending                         if(isAsc)                         {                        if(arr[i]>arr[j])                             {                            int temp = arr[i];                                 arr[i] = arr[j];                                 arr[j] = temp;                             }                         }                    //Descending                         else                         {                        if(arr[i]<arr[j])                             {                            int temp = arr[i];                                 arr[i] = arr[j];                                 arr[j] = temp;                             }                         }                     }                 }            return arr;             }