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I am generating a random number and using the random am generating the AES key of 256 bit. If I use the same random number again, whether it will generate the same AES Key again ? If not means why ?

Thanks in advance..

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If thats the only source of random entropy then, of course it would generate the same key. –  Ramhound Apr 26 at 18:40

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I have only used PBKDF2 and it generates the same key every time. I think that as long as you use the same key derivation function with the same parameters every time (like the random number in this case), it will. I suggest you to read a bit about the key derivation function you are using.

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