using System; using System.IO; class Example { static void Main() { using (BinaryWriter writer = new BinaryWriter(File.Open("test.bin", FileMode.Create))) { writer.Write((byte)12); writer.Write((byte)34); writer.Write((byte)56); } } }Description of the example: This example demonstrates the use of the WriteByte method with the BinaryWriter class to write three bytes to a file named "test.bin". We first create an instance of the BinaryWriter class and pass it an instance of the FileStream class that is opened in "Create" mode. We then use the Write method to write three individual bytes to the file. Package library: The WriteByte method is part of the System.IO namespace, which is a part of the .NET Framework Class Library.