Convert captured image into binary by webcam.

i have serious issue when i capture image using webcam image is captured and transfered to the main page from sub page. all working fine but when i try to save all record into database their is no response from the page. when i used debugging to see what going wrong its showing me image1.imageurl is null but actually their is image displayed from the webcam. but behind code showing me null what to do in this cas. image is displaying but code showing null i have used (!IsPostBack) property in my project.