EF 4.1.3 Implenting Rowversion for Concurrency is not working

Question

I have got a BaseEntity class which contains a, byte array called stamp, id and state, which every Entity inherits from I am mapping the stamp to

 Property(t => t.Stamp).IsRequired().IsRowVersion();

this is set in BaseEntityConfiguration which is set like this

 public BaseEntityConfiguration<T> : EntityTypeConfiguration<T> where T :B aseEntity

The mapping is done like this

var baseMapConfiguration = new BaseEntityConfiguration<EntityA>();
           modelBuilder.Configurations.Add(baseMapConfiguration);
           var entityAMap = new EntityAMap(baseMapConfiguration);

The database has Stamp ROWVERSION NOT NULL; on the Table EntityA I have code that handles DbUpdateConcurrencyException but this does not get caught even though the stamps are different Also there is no where clause on with the Stamp field which I would expected

    SELECT 
[Extent1].[Id] AS [Id], 
[Extent1].[LastModified] AS [LastModified], 
[Extent1].[CreatedDate] AS [CreatedDate], 
[Extent1].[Stamp] AS [Stamp]
FROM [dbo].[EntityA] AS [Extent1]

As you seen no where statement I have also tried it from the with a normal mapping set up but still get the same result

**I have found the problem EF is getting the latest Rowversion instead of the passed in one, How can I stop this. **

Answer 1

if (!EntityA.Stamp.Equals(orignal.Stamp))
{
     ctx.Entry(orignal).OriginalValues["Stamp"] = xmlFile.Stamp;
}

I was missing these line of codes from the DAL, this is stop EF putting the current stamp as the search criteria.