static void Main (string[] args) {

	PerformanceCounter cpuCounter1 = new PerformanceCounter("Processor", "% Processor Time", "_Total"); 

	PerformanceCounter cpuCounter2 = new PerformanceCounter("Processor", "% Privileged Time", "_Total");  

	PerformanceCounter cpuCounter3 = new PerformanceCounter("Processor", "% User Time", "_Total"); 


		while (true) 

		{

			Console.WriteLine($" CPU_Processor Time  :\t  {cpuCounter1.NextValue()} %");

			Console.WriteLine($" CPU_Privileged Time :\t  {cpuCounter2.NextValue()} %");

			Console.WriteLine($" CPU_User Time       :\t  {cpuCounter3.NextValue()} %");
		
			Console.WriteLine();

			Thread.Sleep(1000);

		}

  }

  static void Main (string[] args) {

  	PerformanceCounter ramCounter = new PerformanceCounter("Memory", "Available MBytes");

	PerformanceCounter privateBytes = new PerformanceCounter("Process", "Private Bytes", currentProcess);

	PerformanceCounter gen2Collections = new PerformanceCounter(".NET CLR Memory", "# Gen 2 Collections", currentProcess);


		while (true) 

		{

			Console.WriteLine($" RAM_Available GBytes:\t  {ramCounter.NextValue()/1024} GB");

			Console.WriteLine($" private bytes       :\t  {privateBytes.NextValue()}");

			Console.WriteLine($" gen 2 collections   :\t  {gen2Collections.NextValue()}");

			Console.WriteLine();

			Thread.Sleep(1000);

		}

  }

  public partial class MainWindow : Window 

    { 

	PerformanceCounter ramCounter = new PerformanceCounter("Memory", "Available MBytes");

	PerformanceCounter cpuCounter = new PerformanceCounter("Processor", "% Processor Time", "_Total"); 


        public MainWindow()

        {
            InitializeComponent();


            System.Windows.Threading.DispatcherTimer dispatcherTimer1 = new System.Windows.Threading.DispatcherTimer();

            dispatcherTimer1.Interval = TimeSpan.FromSeconds(1);

            dispatcherTimer1.Tick += timer_Tick;

            dispatcherTimer1.Start();

        }


        private void  timer_Tick(object sender, EventArgs e)

        {
            txtboxRam.Text = (ramCounter.NextValue() / 1024).ToString("F");

            txtboxCpu.Text = cpuCounter.NextValue().ToString();


            if ((ramCounter.NextValue() / 1024) < 6)

            {

                txtboxRam.Background = Brushes.Red;

            }

            else

            {

                txtboxRam.Background = Brushes.White;

            }

        }

    }

WPF

  <Grid> 

	  <Grid.ColumnDefinitions>

	     <ColumnDefinition/>

	   </Grid.ColumnDefinitions>

	   <Grid.RowDefinitions>

	   	  <RowDefinition Height="100"/>

	      <RowDefinition Height="Auto"/>

	   </Grid.RowDefinitions>


	   <StackPanel Grid.Row="0" Background="AliceBlue"> 

	     <TextBlock Text="RAM & CPU Usage" Margin="15 40 0 0" FontSize="18" FontWeight="Bold" /> 

	   </StackPanel>


	<Grid Grid.Row="1" Margin="15">

	    <Grid.ColumnDefinitions>

	      <ColumnDefinition Width="160"/>

	      <ColumnDefinition Width="160"/>

	      <ColumnDefinition Width="100"/>

	    </Grid.ColumnDefinitions>

	    <Grid.RowDefinitions>

	      <RowDefinition/>

	      <RowDefinition/>

	      <RowDefinition/>

	    </Grid.RowDefinitions>


	   <Label Content="Available Memory" Margin="0 13" FontSize="18" Grid.Row="0" HorizontalAlignment="Center"/>

	   <Label Content="CPU" Margin="0 13" FontSize="18" Grid.Row="1" HorizontalAlignment="Center"/>


	   <TextBox x:Name="txtboxRam" Grid.Row="0" Grid.Column="1" Height="30"  FontSize="20" VerticalContentAlignment="Center"/>

	   <TextBox x:Name="txtboxCpu" Grid.Row="1" Grid.Column="1" Height="30"  FontSize="20" VerticalContentAlignment="Center"/>


	   <Label Content="Gegabytes" Margin="0 13" FontSize="16" Grid.Row="0" Grid.Column="2"/>

	   <Label Content="%" Margin="0 13" FontSize="16" Grid.Row="1" Grid.Column="2"/>

	</Grid>

  </Grid>

  static void Main (string[] args) {

   try
 	{
           Console.Write("Enter First Number: ");
           int Numerator = Convert.ToInt32(Console.ReadLine());

           Console.Write("Enter Second Number: ");
           int Denominator = Convert.ToInt32(Console.ReadLine());

           int Result = Numerator / Denominator;
           Console.WriteLine("Result = {0}", Result);
	}
 

   catch (DivideByZeroException)
	{
           Console.WriteLine("DivideByZeroException: Denominator cannot be zero");
	}
 

   catch (FormatException)
	{
           Console.WriteLine("FormatException: Please enter a number");
	}
 

   catch (OverflowException)
	{
           Console.WriteLine($"OverflowException: only number {Int32.MinValue} && {Int32.MaxValue} are allowed");
	}
 

   catch (Exception ex)
	{
           Console.WriteLine(ex.Message);
	} 

  }