How to user Automapper for mapping different datatypes fields on two different models

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AutoMapper

Want to know how I can do mapping while things about mapping two different class with different datatypes fields for inserting and retrieving data from database.
class 1 UserModel= public string ProfileImage {get; set;}(viewmodel)
class 2 User= public byte[] ProfileImage {get; set;}(databasemodel)

want to map these two property for uploading image and retrieving image by using automapper and database.(note : I am using serialized concept too for ex: datamember )