save picture box image into one folder

Question

hi
  i am using windows application. in that form i place picturebox, openfiledialogue, loadimage, saveimage buttons.
  using loadimage button to load image into picture box.
  using saveimage button to save image into one folder(save image into harddisk)
  at the time of save image first we crop the image like height:100 and width:100
  and next it saved to folder.
how todo it. please give me a solution and please give a sample solution
Thanks.