The BinaryWriter Object works at lower level of Streams. BinaryWriter is used for write premitive types as binary values in a specific encoding stream. BinaryWriter Object works with Stream Objects that provide access to the underlying bytes. For creating a BinaryWriter Object , you have to first create a FileStream Object and then pass BinaryWriter to the constructor method .
Dim writeStream As FileStream
writeStream = New FileStream("c:\testBinary.dat", FileMode.Create)
Dim writeBinay As New BinaryWriter(writeStream)
The main advantages of Binary information is that it is not easily human readable and stores files as Binary format is the best practice of space utilization.