Simple task manager in C# , built using .NET Core with .NET SDK 2.2.104

Program.cs

using System;
using System.Diagnostics;
using System.Collections;

namespace Test
{
    public class Program
    {
        public static int Main(string[] args)
        {
            Hashtable arguments = new Hashtable();  // A hashtable to store key/value command line arguments

            bool show_priority = false;     // Does the caller want to see priorities ?
            bool show_threads = false;      // Does the caller want to see number of threads for each process ?
            
            // At first , we'll be filtering out the non key/value arguments
            for (int i = 0; i < args.Length; i++) {
                if (args[i].Contains('=')) {
                    continue;
                }

                if (args[i] == "--show-priority") {
                    show_priority = true;
                }

                if (args[i] == "--show-threads") {
                    show_threads = true;
                }
            }

            // Now , we'll be filtering out the key/value arguments
            for (int i = 0; i < args.Length; i++) {
                if (!args[i].Contains('=')) {
                    continue;
                }
                string key      = args[i].Split('=')[0];
                string value    = args[i].Split('=')[1];
                arguments.Add(key, value);
            }

            int refresh_rate = 5000;        // A refresh rate that indicates the required period before updating processes list
            int refresh_count = 1;          // Defines how many times the processes list should be updated   

            if (arguments.ContainsKey("--refresh-rate")) {
                refresh_rate = Convert.ToInt32(arguments["--refresh-rate"]);
                if (refresh_rate < 0) {
                    Console.WriteLine("Notice: Refresh Rate is negative , setting it now to 5000 ms ...");
                    refresh_rate = 5000;
                }
            }

            if (arguments.ContainsKey("--refresh-count")) {
                refresh_count = Convert.ToInt32(arguments["--refresh-count"]);
                if (refresh_count <= 0) {
                    Console.WriteLine("Notice: Refresh Rate is negative or zero , setting it now to 1 ...");
                    refresh_count = 1;
                }
            }

            for (int i = 0; i < refresh_count; i++) {
                System.Diagnostics.Process.Start("clear");  //  Clear console screen
                Process[] Processes = System.Diagnostics.Process.GetProcesses();    //  Get processes list
                Console.Write("{0,10}\t|{1,20}", "ID", "Name");

                if (show_priority) {
                    Console.Write("\t|{0,15}", "Priority");
                }
                if (show_threads) {
                    Console.Write("\t|{0,10}", "Threads");
                }

                Console.WriteLine();

                Console.WriteLine("\t-------------------------------------------------------------------------");
                foreach (Process P in Processes) {
                    Console.Write("{0,10}\t|{1,20}", P.Id, P.ProcessName);
                    if (show_priority) {
                        Console.Write("\t|{0,15}", P.PriorityClass);
                    }
                    if (show_threads) {
                        Console.Write("\t|{0,10}", P.Threads.Count);
                    }
                    Console.WriteLine();

                }
                System.Threading.Thread.Sleep(refresh_rate);    // Hold on for a while
            }
            return 0;
        }
    }
}