VS2008 / SQL Server 2005 / Windows XP

I have been unable to generate a concurrency exception using a single table
in a  DataContext.dbml with Insert / Update / Delete SPs via a LINQDataSource
and a FormView.

I am able to successfully add, update and delete rows but not generate a
concurrency exception.

After two days I'm feeling pretty darned stumped!!  I can bundle the whole
thing up if anybody is up for taking a look.

Here is the SQL I am using:

CREATE TABLE [dbo].[Departments](
    [PKID] [int] IDENTITY(1,1) NOT NULL,
    [Code] [varchar](10) NOT NULL,
    [Description] [varchar](50) NOT NULL,
    [TS] [timestamp] NOT NULL,
CONSTRAINT [PK_Departments] PRIMARY KEY CLUSTERED
(
    [PKID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY =
OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]
GO

CREATE PROCEDURE [dbo].[zDepartmentInsert]

    @PKID INT OUTPUT,
    @Code VARCHAR(10),
    @Description VARCHAR(50),
    @TS TIMESTAMP OUTPUT

AS

    INSERT INTO [dbo].[Departments] (
        [Code],
        [Description]
    ) VALUES (
        @Code,
        @Description)

    SELECT
        @PKID = SCOPE_IDENTITY(),
        @TS = TS
    FROM [dbo].[Departments]
    WHERE
        [PKID] = SCOPE_IDENTITY()
GO

CREATE PROCEDURE [dbo].[zDepartmentUpdate]

    @PKID int,
    @Code varchar(10),
    @Description varchar(50),
    @TS timestamp OUTPUT

AS

    UPDATE [dbo].[Departments] SET
        [Code] = @Code,
        [Description] = @Description   
    WHERE
        [PKID] = @PKID AND
        [TS] = @TS

    SELECT
        @TS = [TS]
    FROM [dbo].[Departments]
    WHERE
        [PKID] = @PKID   
GO

CREATE PROCEDURE [dbo].[zDepartmentDelete]

    @PKID int,
    @TS timestamp

AS

    DELETE FROM
        [dbo].[Departments]
    WHERE
        [PKID] = @PKID AND
        [TS] = @TS
GO