How to rewrite data member/constructor/method name of a class in the assembly?

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C#

I'm developing an application based on obfuscation of .net code. Using reflection namespace, i have extracted all the relevant information of the assembly namely class name, data member name, contructor name, method name etc. I have to apply encryption on certain strings which are the name of these extracted information. Help me out in rewriting these names from the encrypted ones.