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I think You will be saving image in the local folder.And file name or type in database.,In that case it's a normal delete.
if you want to delete file from folder
try this
Name space--Using system.IO
File.delete(server.Mappath(filename));
http://msdn.microsoft.com/en-us/library/system.io.filesystemwatcher.aspx
refer the below link..,
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where do you store the image in local folder or database...,?