In C# multithreading is a way to implement multitasking.

Example

  for (int i = 1; i <= 5;i++)
    {
      //creating thread for display() method
      Thread t = new Thread(new ThreadStart(display));
       //starting thread.
      t.Start();
    }  
 
    int i =0;
       
  public void display()
   {
    i++;
      //displaying messagebox.
    MessageBox.Show(i.ToString());           
   }

 Screen Shot

Here we can see that all five message boxes are displayed. But if we had not used

threading then only one message box will be displayed and second box will be

displayed only after clicking on OK button of first Message Box. All five message

boxes are displayed simultaneously as different thread are created for display()

method called from loop.