[Help Me] How to write file without overwrite ?

Dim Path as String = "C.dat"
File.WriteAllBytes("Path", File.ReadAllBytes("A.dat"))
File.WriteAllBytes("Path", File.ReadAllBytes("B.dat"))

Use FileStream instead of the static "File"-methods for writing.

How to use Filestream ?
I am new

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thnx to replay
solve my problem