image resizing in pictureBox

Question

I am creating a windows form application in which i want to show a image in a picturebox which is selected by user. I made a button on the click of which, browser window appears and user can select picture from his computer but i want that image to fit in the given size of pictureBox. In short, I want to adjust the image size automatically according to my pictureBox but i am unable to do it. Please Help.

 

here is my code -->>

 

private void button1_Click(object sender, EventArgs e)

{

  OpenFileDialog open = new OpenFileDialog();

  open.Filter = "Image Files(*.jpg; *.jpeg)|*.jpg; *.jpeg";

 

if (open.ShowDialog() == DialogResult.OK)

   {

pictureBox1.Image = new Bitmap(open.FileName);

sizing(pictureBox1.Image, pictureBox1.Image.Size);

     }

}

public void sizing(Image img, Size siz)

{

int sWidth = img.Width;

int sHeight=img.Height;

float nPercent = 0;

float nPercentW = 0;

float nPercentH = 0;

nPercentW = ((float)siz.Width / (float)sWidth);

nPercentH = ((float)siz.Height / (float)sHeight);

if (nPercentH < nPercentW)

nPercent = nPercentH;

else

nPercent = nPercentW;

int destWidth = (int)(sWidth * nPercent);

int destHeight = (int)(sHeight * nPercent);

Bitmap b = new Bitmap(destWidth, destHeight);

pictureBox1.Image = (Image)b;

}