cannot scroll back the image which is left and top part of panel

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C#

C#4.0

i am using a form in that added a panel and picture box. now i am zoom an image to its center, but my problem is i cannot scroll back the image which is left and top part of panel. how can i scroll it

zoomIn code:

pictureBox1.Top = (int)(pictureBox1.Top - (pictureBox1.Height * 0.025));
pictureBox1.Left = (int)(pictureBox1.Left - (pictureBox1.Width * 0.025));
pictureBox1.Height = (int)(pictureBox1.Height + (pictureBox1.Height * 0.05));
pictureBox1.Width = (int)(pictureBox1.Width + (pictureBox1.Width * 0.05));

using auto scroll for panel