Here's an example program in C# that uses the `System.Drawing` namespace to draw a circle on a Windows Form:
// Mohit Kumar Tyagi
using System;
using System.Drawing;
using System.Windows.Forms;
public class CircleDrawingForm : Form
{
public CircleDrawingForm()
{
// Set the form size and title
Size = new Size(400, 400);
Text = "Circle Drawing Example";
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
// Create a Graphics object from the Form's CreateGraphics() method
Graphics g = e.Graphics;
// Set the circle color and thickness
Pen pen = new Pen(Color.Red, 2);
// Define the circle's center point and radius
int centerX = 200;
int centerY = 200;
int radius = 100;
// Calculate the top-left corner of the bounding rectangle
int x = centerX - radius;
int y = centerY - radius;
// Draw the circle
g.DrawEllipse(pen, x, y, radius * 2, radius * 2);
// Dispose of the pen and graphics objects
pen.Dispose();
g.Dispose();
}
public static void Main()
{
// Create an instance of the CircleDrawingForm class
Application.Run(new CircleDrawingForm());
}
}
To run this program, create a new Windows Forms Application project in Visual Studio or any other C# IDE, and replace the default code with the code above. When you run the program, it will display a window with a circle drawn at the center (200, 200) with a radius of 100 pixels.
In this example, the `OnPaint` method is overridden to handle the drawing of the circle. The `Pen` class is used to define the color and thickness of the circle's outline. The `DrawEllipse` method of the `Graphics` class is used to draw the circle by specifying the top-left corner of the bounding rectangle and the width and height of the rectangle.
