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    <p>If you grab the NHib source code, there's a class in a test project that will help you with what you need: NHibernate.Test.VersionTest.Db.MsSQL.BinaryTimestamp. Basically, you have to give it a custom type it can use to convert the value. Be default NHib expects the value to be an int (look at seciont 5.1.7 of <a href="http://nhibernate.info/doc/nh/en/index.html#mapping-declaration-timestamp" rel="nofollow noreferrer">the nhib docs</a>). If you use an int/bigint as your version column, you will not need a custom type.</p> <p>The custom class (lifted from NHib source code):</p> <pre><code>public class BinaryTimestamp : IUserVersionType { #region IUserVersionType Members public object Next(object current, ISessionImplementor session) { return current; } public object Seed(ISessionImplementor session) { return new byte[8]; } public object Assemble(object cached, object owner) { return DeepCopy(cached); } public object DeepCopy(object value) { return value; } public object Disassemble(object value) { return DeepCopy(value); } public int GetHashCode(object x) { return x.GetHashCode(); } public bool IsMutable { get { return false; } } public object NullSafeGet(IDataReader rs, string[] names, object owner) { return rs.GetValue(rs.GetOrdinal(names[0])); } public void NullSafeSet(IDbCommand cmd, object value, int index) { NHibernateUtil.Binary.NullSafeSet(cmd, value, index); } public object Replace(object original, object target, object owner) { return original; } public System.Type ReturnedType { get { return typeof(byte[]); } } public SqlType[] SqlTypes { get { return new[] { new SqlType(DbType.Binary, 8) }; } } public int Compare(object x, object y) { var xbytes = (byte[])x; var ybytes = (byte[])y; return CompareValues(xbytes, ybytes); } bool IUserType.Equals(object x, object y) { return (x == y); } #endregion private static int CompareValues(byte[] x, byte[] y) { if (x.Length &lt; y.Length) { return -1; } if (x.Length &gt; y.Length) { return 1; } for (int i = 0; i &lt; x.Length; i++) { if (x[i] &lt; y[i]) { return -1; } if (x[i] &gt; y[i]) { return 1; } } return 0; } public static bool Equals(byte[] x, byte[] y) { return CompareValues(x, y) == 0; } } </code></pre> <p>A sample mapping using that class:</p> <pre><code>public class Car { public virtual long CarId { get; set; } public virtual string Name { get; set; } public virtual byte[] LastModified { get; set; } public override string ToString() { return string.Format("Id: {0}, Name: {1}, Last Modified: {2}", CarId, Name, LastModified); } } public class CarMap : ClassMapping&lt;Car&gt; { public CarMap() { Table("Cars"); Id(car =&gt; car.CarId, mapper =&gt; mapper.Generator(Generators.Identity)); Property(car =&gt; car.Name); Version(car =&gt; car.LastModified, mapper =&gt; { mapper.Generated(VersionGeneration.Always); mapper.Type&lt;BinaryTimestamp&gt;(); }); } } </code></pre>
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