how to show image on the webform

i have a form to save employee information including employee image,image is saving properly using following code.

 Employee.ImgBody = (Employee.ImgBody == null) ? new byte[0] : Employee.ImgBody;
 //Image saving code                  Byte[] imgByte = null;
 if (txtEpPicture.HasFile && txtEpPicture.PostedFile != null)  
               {        
             //To create a PostedFile                    
 HttpPostedFile File = txtEpPicture.PostedFile;  
                   //Create byte Array with file len 
                    imgByte = new Byte[File.ContentLength];    
                 //force the control to load data in array 
                    File.InputStream.Read(imgByte, 0, File.ContentLength); 
                    Employee.ImgBody = imgByte;    
             } 

now i want to show that image when user select any employee and also want to update that image if user need. i want to show image into the form by using following code

empPicture.ImageUrl = string.Format("EmpPicture.ashx?id={0}", Employee.Id); 

i have search and try different solution from the google,but all in vain,image is in db in the form of varbinary.