**We can draw circle on windows form using various functions provided by System.Drawing namespace. But using those methods will not give you points on circumference of circle which you may need sometime. Here I come up with solution to this problem. **

We can find points on circumference using following mathematical formulas.

X = x0 + r Cos 0

Y = y0 + r Sin 0

Point on circumference = (X, Y) and

Center = (x0, y0)

An angle = 0

Here is the code for finding points and drawing the circle

private void Form1_Paint(object sender, PaintEventArgs e)

{

//Graphics object

Graphics graphics = e.Graphics;

//array of points

PointF[] CircumferencePoints = new PointF[360];

//path type points to show direction

byte[] pathType = new byte[360];

//loop and collect points starting from angle 0 to 360

double THETA = 0.0;

for (int i = 0; i < 360; i++)

{

CircumferencePoints[i].X = (float)(200 + 100 * (Math.Cos(THETA * Math.PI / 180)));

CircumferencePoints[i].Y = (float)(200 + 100 * (Math.Sin(THETA * Math.PI / 180)));

//keep angle increasing by 1

THETA += 1.0;

//give path type

pathType[i] = (byte)PathPointType.Line;

}

//This smoothing is neccessary for High quality curve

graphics.SmoothingMode = SmoothingMode.HighQuality;

System.Drawing.Drawing2D.GraphicsPath path = new System.Drawing.Drawing2D.GraphicsPath(CircumferencePoints, pathType);

//Draw circle using Draw path method

graphics.DrawPath(new Pen(Brushes.Black, 3), path);

//Fill the circle with color

graphics.FillClosedCurve(Brushes.Orange, CircumferencePoints);

}