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I have a BinaryReader/BinaryWriter with a length of 1000 bytes, each record is 50 bytes. How can I eliminate the records at position 350 to 550 and in the end keep the remaining 800 bytes in my file?
The simplest way would be to loop through the records, reading from one file and writing to a new one, and eliminating the records you don’t need.
In theory you could seek within the same file, overwriting the “old” data with new data, but I’d personally go for a simple approach where possible. It also means that if anything fails half way through, you’ve still got the original file and a “bad” file which can just be deleted, rather than a file which may contain some records twice.