title: Drawing a grid on a PictureBox
body: <p>I am currently working with a pictureBox. I am having difficulties drawing a grid over the picture box that is approximately the size of 2 x 2 squares. Now the code below is only giving me a line drawn across. How can I proplery draw a full grid on top of the pictureBox?</p>
  
  <p><strong>CODE:</strong></p>
  
  <pre><code>private Graphics g1;
  
      public Form1()
      {
          InitializeComponent();
  
  
          pictureBox1.Image = new Bitmap(500, 500);
          g1 = Graphics.FromImage(this.pictureBox1.Image);
          Pen gridPen = new Pen(Color.Black, 2);
          g1.DrawLine(gridPen, 0, 0, 100, 100);
  
      }
  </code></pre>
  
  <p>This what I would like to accomplish:
  <img src="https://i.stack.imgur.com/bmEgz.png" alt="enter image description here"></p>