How Do I Do Two Task At One Time In Console Application C#

At the most basic level you can use a new Thread, or you can use BackgroundWorker, it all depends on what level of communication and control you need between the main thread and the child thread. Multi-threading is a fairly indepth subject so you might need to read up about it. Most problems with multi-threading involve synchronising the threads, or one thread telling another thread to stop running, when you need to "join" the other thread etc. Here is a very basic example though.

public static void DoSomething()
{
    for (int i = 0; i < 5; i++)
    {
        Thread.Sleep(500);
        Console.WriteLine("DoSomething {0}", i);
    }
}

public static void task(string[] args)
{
    Thread t = new Thread(new ThreadStart(DoSomething));
    t.Start();

    string str = "";
            
    for (;;)
    {
        for (int i = 0; i < 3; i++)
        {
            str += ".";
            Console.Write("\rPerforming Some Task{0} ", str);
            if (i <= 2)
                Thread.Sleep(1000);
            if (i == 2)
            {
                Console.Write("\b\b\b  ");
                str = "";
            }
        }
    }
}

Here is a solution that keeps all processing on child threads

class Program
{
    private static bool running = false;

    static void Main(string[] args)
    {
        Thread t = new Thread(new ParameterizedThreadStart(task));
        t.Start(args);

        // wait for the [RETURN] key to be pressed
        Console.ReadLine();

        // set flag that tells the other threads to stop
        running = false;
            
        // wait for t to finish
        t.Join();
    }

    public static void DoSomething()
    {
        for (int i = 0; i < 5; i++)
        {
            Thread.Sleep(500);
            Console.WriteLine("DoSomething {0}", i);
        }
    }

    public static void task(object a)
    {
        running = true;
        string[] args = (string[])a;

        Thread t = new Thread(new ThreadStart(DoSomething));
        t.Start();

        string str = "";
            
        while (running)
        {
            for (int i = 0; i < 3; i++)
            {
                str += ".";
                Console.Write("\rPerforming Some Task{0} ", str);
                if (i <= 2)
                    Thread.Sleep(1000);
                if (i == 2)
                {
                    Console.Write("\b\b\b  ");
                    str = "";
                }
            }
        }
    }
}