DataAnnotations - TimeStamp Attribute:

TimeStamp attribute can be applied to only one byte array property of a domain class. TimeStamp attribute creates a column with timestamp datatype. Code-First automatically use this TimeStamp column in concurrency check.

Consider the following example.

using System.ComponentModel.DataAnnotations;

public class Student
{
    public Student()
    { 
        
    }

    public int StudentKey { get; set; }
     
    public string StudentName { get; set; }
        
    [TimeStamp]
    public byte[] RowVersion { get; set; }
}
     

As you can see in the above example, TimeStamp attribute is applied to Byte[] property of the Student class. So, Code First will create a timestamp column RowVersion in the Student table as shown below.

Entity Framework Code-First（9.2）：DataAnnotations - TimeStamp Attribute

原文：http://www.cnblogs.com/purplefox2008/p/5644109.html