Strongest Encyption and Decryption

Good morning to all, 
     Just want to ask, what is the strongest encryption and decrption that i can use using c#..? Using your suggested encryption and decryption.. Can i use this to encypt and decrypt some part of the  script..? for example i have a account number 1234567890.. when displaying this account number it should be "123456xjoh" is this possible..?


    Hope to hear from you soon..


Thanks,


Link

 



...