checking correct or not

Question

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApplication58
{
public partial class Form1 : Form
{
Graphics g;
int x = -1;
int y = -1;
bool moving = false;
Pen pen;
public Form1()
{
InitializeComponent();
g = panel1.CreateGraphics();
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
pen = new Pen(Color.Black, 5);
pen.StartCap = pen.EndCap = System.Drawing.Drawing2D.LineCap.Round;
}
private void pictureBox1_Click(object sender, EventArgs e)
{
PictureBox p = (PictureBox)sender;
pen.Color = p.BackColor;
}
private void panel1_MouseDown(object sender, MouseEventArgs e)
{
moving = true;
x = e.X;
y = e.Y;
}
private void panel1_MouseMove(object sender, MouseEventArgs e)
{
if (moving && x != -1 && y != -1)
{
g.DrawLine(pen, new Point(x, y), e.Location);
x = e.X;
y = e.Y;
}
}
private void panel1_MouseUp(object sender, MouseEventArgs e)
{
moving = false;
x = -1;
y = -1;
}
private void Drawarc(object sender, PaintEventArgs e)
{
Pen blackPen = new Pen(Color.Black, 3);
// Create coordinates of rectangle to bound ellipse.
float x1 = 420.0F;
float y1 = 178.0F;
float x2 = 425.0F;
float y2 = 228.0F;
float width1 = 60.0F;
float height1 = 50.0F;
float width2 = 60.0F;
float height2 = 50.0F;
// Create start and sweep angles on ellipse.
float startAngle1 = 75.0F;
float startAngle2 = 255.0F;
float sweepAngle1 = 220.0F;
float sweepAngle2 = 220.0F;
float[] dashValues = { 2, 2, 2, 2 };
blackPen.DashPattern = dashValues;
e.Graphics.DrawLine(blackPen, new Point(400, 150), new Point(530, 150));
e.Graphics.DrawLine(blackPen, new Point(465, 150), new Point(465, 178));
e.Graphics.DrawLine(blackPen, new Point(420, 278), new Point(460, 278));
e.Graphics.DrawLine(blackPen, new Point(495, 250), new Point(498, 253));
// e.Graphics.DrawLine(blackPen, new Point(430, 230), new Point(480, 270));
// e.Graphics.DrawLine(blackPen, new Point(430, 230), new Point(480, 230));
// Draw arc to screen.
e.Graphics.DrawArc(blackPen, x1, y1, width1, height1, startAngle1, sweepAngle1);
e.Graphics.DrawArc(blackPen, x2, y2, width2, height2, startAngle2, sweepAngle2);
}
}
}

here is the code for painting and drawing dash line now i want that when i paint/drawline over dash line then it should say it is correct otherwise it is false