C# load encrypted exe

I would like to know all the ways to load a exe from encryptedtodecrypted filestream using the rijndaelmanaged(or any encryption) method.

Currently i know you can use

Using system.reflection;
Using system.IO;
Using system.security.cartography;

Filestream x = new Filestream(textbox1.text);
Assembly.load(decrypt(x));

but what other ways are possible