hidden field

Question

hi!
   hi i am using HiddenField to save my image path. when i update new image old image is deleted and new image is saved in my Thumbnails folder. how can i do it using hiddenfield. please give a example code.
Means i take one image control and fileupload. first i load image into image control then image is saved into Thumbnails folder and again  i load image into image control new image is saved into my Thumbnails folder(old image deleted and new image inserted) here i take two folders one for photos and second for thumbnail.
this update image manipulations are work in photos folder. in that i use photopath=image1.imageurl
in thumbnails which path i take. i take hiddenfield if i update image first image filename is gone and new image filename is come into the hiddenfield.
please give a solution.
Thanks.