c# MemoryStream vs Byte Array

Question

I have a function, which generates and returns a MemoryStream. After generation the size of the MemoryStream is fixed, I dont need to write to it anymore only output is requ

Answer 1

Use a byte[] because it's a fixed sized object making it easier for memory allocation and cleanup and holds relatively no overhead - especially since you don't need to use the functions of the MemoryStream. Further you want to get that stream disposed of ASAP so it can release the possible unmanaged resources it may be using.