why using the conditional statement with Paint event does not work fine?

Dear all,

I have a code to draw an arc which works fine, but when I am using a conditional statement like IF with that , there is no error but I cannot see the Arc on the form

please look at these two codes , one of them with "If " statement and another without:

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;

namespace _1

public partial class Form1 : Form

public Form1()

private void Form1_Paint(object sender, PaintEventArgs e)

Graphics g = e.Graphics;

Pen pn = new Pen(Color.Blue);

Rectangle rect = new Rectangle(50, 50, 200, 100);

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;

namespace _1

public partial class Form1 : Form

public Form1()

public int m;

private void Form1_Paint(object sender, PaintEventArgs e)

if (m == 1)

Graphics g = e.Graphics;

Pen pn = new Pen(Color.Blue);

Rectangle rect = new Rectangle(50, 50, 200, 100);