Laba number 1 c#

using System;
Console.WriteLine("Select a task(1,2,3):");
int num = Convert.ToInt32(Console.ReadLine());


switch (num)
{
    case 1:
        Console.WriteLine("Task 1!");
        object[] myArray = new object[5];
        string line;
        Console.WriteLine("Enter massive");
        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 massive:");
        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];
        decimal[] arraySlice = new decimal[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] = Math.Round((random.Next(1050, 3000) / 3.0m), 2);
            }
        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:");
        int line
        for (var i = 0; i < array.GetLength(0); i++)
            for(var k = 0; k < array.GetLength(1); k++)
                for(var j = 0; j < array.Length; j++)
        Console.ReadLine();
        break;

    case 3:
        Console.WriteLine("Task 3!");
        break;
    default:
        Console.WriteLine("Wrong number!");
        break;
}