Decrypt the Particular column in linq

Decrypt the Particular column(i.e.Email) of a list from a list using linq.

Here is the code:

In this _dbData a column name Email.This email is decrypted.

Here is the class to encypt the Email (AESCryptography.AES256_Decrypt). I am try this code :

_dbData = (decrypted.ToList().Select(u => AESCryptography.AES256_Decrypt(u.Email))).ToList();

but not working.

I want to Fetch the list with the email column decrypted value.