Laba number 1 c#

using System;


while (true)
{
    Console.ReadKey();
    Console.Clear();
    Console.WriteLine("Select a task(1,2,3) or exit(4):");
    int num = Convert.ToInt32(Console.ReadLine());
    switch (num)
    {
        case 1:
            Console.WriteLine("Task 1!");
            object[] myArray = new object[5];
            string line;
            Console.WriteLine("Enter array");
            for (var i = 0; i < myArray.Length; i++)
            {
                Console.Write($"myArray[{i}] = ");
                line = Console.ReadLine();
                if (double.TryParse(line, out double value))
                {
                    myArray[i] = Math.Abs(value);
                }
                else if (int.TryParse(line, out int value1))
                {
                    myArray[i] = Math.Abs(value1);
                }
                else
                {
                    myArray[i] = line;
                }

            }

            Console.WriteLine("Changed array:");
            for (var i = 0; i < myArray.GetLength(0); i++)
            {
                Console.Write(myArray[i] + " ");
            }
            break;
        case 2:
            Console.WriteLine("Task 2!");
            decimal[,] array = new decimal[3, 4];

            Random random = new Random();
            for (var i = 0; i < array.GetLength(0); i++)
                for (var j = 0; j < array.GetLength(1); j++)
                {
                    array[i, j] = random.Next(-100, 100);
                }
            for (var i = 0; i < array.GetLength(0); i++)
            {
                for (var j = 0; j < array.GetLength(1); j++)
                {
                    Console.Write(array[i, j] + "\t");
                }
                Console.WriteLine();
            }
            Console.WriteLine("Array after sort:");
            decimal tmp;
            for (var i = 0; i < array.GetLength(0); i++)
                for (var k = 0; k < array.GetLength(1); k++)
                    for (var j = 0; j < array.GetLength(1) - 1 - k; j++)
                    {
                        if (array[i, j] > array[i, j + 1])
                        {
                            tmp = array[i, j];
                            array[i, j] = array[i, j + 1];
                            array[i, j + 1] = tmp;
                        }

                    }
            for (var i = 0; i < array.GetLength(0); i++)
            {
                for (var j = 0; j < array.GetLength(1); j++)
                {
                    Console.Write(array[i, j] + "\t");
                }
                Console.WriteLine();
            }

            break;

        case 3:
            Console.WriteLine("Task 3!");
            break;

        case 4:
            Environment.Exit(0);
            break;
        default:
            Console.WriteLine("Wrong number!");
            break;
    }

}