BitConverter.GetBytes (UInt64) returns 64-bit unsigned integer value as an array of bytes.
Imports System Imports System.Globalization Imports Microsoft.VisualBasic Module GetBytesUInt64Demo Sub GetBytesUInt64( argument As UInt64 ) Dim byteArray As Byte( ) = BitConverter.GetBytes( argument ) Console.WriteLine(BitConverter.ToString( byteArray ) ) End Sub Sub Main( ) GetBytesUInt64( Convert.ToUInt64( &HFFFFFF ) ) End Sub End Module