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    <p>Thanks to @sgmoore . The values to be updated are set after the Attach method. Now it is working. Is there anything yet to improve?</p> <p>Generated SQL</p> <pre><code>UPDATE [dbo].[Account] SET [AccountType] = @p2, [Duration] = @p3, [ModifiedTime] = @p4 WHERE ([AccountNumber] = @p0) AND ([ModifiedTime] = @p1) -- @p0: Input Int (Size = -1; Prec = 0; Scale = 0) [1] -- @p1: Input DateTime (Size = -1; Prec = 0; Scale = 0) [6/25/2012 5:08:32 PM] -- @p2: Input NChar (Size = 10; Prec = 0; Scale = 0) [NEXT] -- @p3: Input Int (Size = -1; Prec = 0; Scale = 0) [4] -- @p4: Input DateTime (Size = -1; Prec = 0; Scale = 0) [6/26/2012 10:29:19 AM] -- Context: SqlProvider(Sql2008) Model: AttributedMetaModel Build: 4.0.30319.1 </code></pre> <p>CODE</p> <pre><code> public void UpdateAccount() { //Used value from previous select DateTime previousDateTime = new DateTime(2012, 6, 25, 17, 8, 32, 677); RepositoryLayer.Account accEntity = new RepositoryLayer.Account(); accEntity.AccountNumber = 1; //Primary Key accEntity.ModifiedTime = previousDateTime; //Concurrency column accountRepository.UpdateChangesByAttach(accEntity); //Values to be modified after Attach accEntity.AccountType = "NEXT"; accEntity.ModifiedTime = DateTime.Now; accEntity.Duration = 4; accountRepository.SubmitChanges(); } public virtual void UpdateChangesByAttach(T entity) { if (Context.GetTable&lt;T&gt;().GetOriginalEntityState(entity) == null) { //If it is not already attached Context.GetTable&lt;T&gt;().Attach(entity); } } </code></pre>
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    1. COI would just like to add a warning to anyone borrowing this code. If for example you wanted to reset a column back to the default value, eg accEntity.AccountType to null, then after your attach you should first set accEntity.AccountType to some non-null value and then set it to null so that the property is flagged as changed.
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