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When we create a byte array like this:
byte[] fileData = System.IO.File.ReadAllBytes("FileName.exe");
Will the size of the file take up the memory?
The File.ReadAllBytes method is implemented in a pretty obvious way. It uses the using resource acquisition block on a FileStream. Then, it loops through the file and puts the bytes into a byte array. In the .NET Framework 4.0, it will throw an exception if the file exceeds 2 gigabytes.
http://www.dotnetperls.com/file-readallbytes