circle angle display in c#

public Texture2D CreateCircle(int radius)
{
    int outerRadius = radius*2 + 2; // So circle doesn't go out of bounds
    Texture2D texture = new Texture2D(GraphicsDevice, outerRadius, outerRadius);

    Color[] data = new Color[outerRadius * outerRadius];

    // Colour the entire texture transparent first.
    for (int i = 0; i < data.Length; i++)
        data[i] = Color.Transparent;

    // Work out the minimum step necessary using trigonometry + sine approximation.
    double angleStep = 1f/radius;

    for (double angle = 0; angle < Math.PI*2; angle += angleStep)
    {
        // Use the parametric definition of a circle: http://en.wikipedia.org/wiki/
        int x = (int)Math.Round(radius + radius * Math.Cos(angle));
        int y = (int)Math.Round(radius + radius * Math.Sin(angle));

        data[y * outerRadius + x + 1] = Color.White;
    }

    texture.SetData(data);
    return texture;
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Timers();


namespace WindowsForms
{
    public partial class Form1 : Form
    {
        int circleDiameter;
              public Form1()
        {
            InitializeComponent();
            circleDiameter = 100;
        }
        

        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            Point CenterPoint = new Point()
            {
                X = this.ClientRectangle.Width / 2,
                Y = this.ClientRectangle.Height / 2
            };
            Point topLeft = new Point()
            {
              

                X = (this.ClientRectangle.Width - circleDiameter) / 2,
                Y = (this.ClientRectangle.Height - circleDiameter) / 2
              
    
        };


            Point topRight = new Point()
            {
                X = (this.ClientRectangle.Width + circleDiameter) / 2,
                Y = (this.ClientRectangle.Height - circleDiameter) / 2
            };
            Point bottomLeft = new Point()
            {
                X = (this.ClientRectangle.Width - circleDiameter) / 2,
                Y = (this.ClientRectangle.Height + circleDiameter) / 2
            };
            Point bottomRight = new Point()
            {
                X = (this.ClientRectangle.Width + circleDiameter) / 2,
                Y = (this.ClientRectangle.Height + circleDiameter) / 2
            };

            e.Graphics.DrawEllipse(Pens.Red, topLeft.X, topLeft.Y, circleDiameter, circleDiameter);
           
           e.Graphics.DrawLine(Pens.Red, CenterPoint, topLeft);
         
         //  e.Graphics.DrawLine(Pens.Black, CenterPoint, topRight);
        
       //     e.Graphics.DrawLine(Pens.Brown, CenterPoint, bottomLeft);
            
         //   e.Graphics.DrawLine(Pens.Orange, CenterPoint, bottomRight); 
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            
        }

    }
}