Very simple interface, a picture box and a button, an open file dialog box, click the button pop-up dialog box, select a picture to load the picture box, and then want to read the file header information, total at this exception, how to do?

 
Private void button1_Click (object sender, EventArgs e) 
{
DialogResult Dr=openFileDialog1. ShowDialog (this); 
If (Dr==DialogResult. OK) 
{
Try 
{
PictureBox1. Image=Image. FromFile (openFileDialog1 FileName); 
FileStream fs=new FileStream (openFileDialog1. The FileName, FileMode. Open);//an unusual 
BinaryReader br=new BinaryReader (fs); 
} 
Catch Exception (err) 
{
MessageBox. Show (err. Message); 
} 
} 
} 

This is the interface


This is an error message box