Csharp/C Sharp by API/System.Drawing/Rectangle

new Rectangle(int x, int y, int width, int height)

  
using System;
using System.Drawing;
class MainClass
{
  public static int Main(string[] args)
  {
    Rectangle r1 = new Rectangle(0, 0, 100, 100);
    Point pt3 = new Point(101, 101);
    if(r1.Contains(pt3))
      Console.WriteLine("Point is within the rect!");
    else
      Console.WriteLine("Point is not within the rect!");
  
    return 0;
  }
}

Rectangle.Contains

  
using System;
using System.Drawing;

class Program {
    static void Main(string[] args) {
        Rectangle r1 = new Rectangle(0, 0, 100, 100);
        Point pt3 = new Point(101, 101);
        if (r1.Contains(pt3))
            Console.WriteLine("Point is within the rect!");
        else
            Console.WriteLine("Point is not within the rect!");
        // Now place point in rectangle"s area.
        pt3.X = 50;
        pt3.Y = 30;
        if (r1.Contains(pt3))
            Console.WriteLine("Point is within the rect!");
        else
            Console.WriteLine("Point is not within the rect!");
    }
}