Entity Framework ConCurrent Issue

Question

Hi Everyone,
I need to build an application that will have concurrent users access MS SQL records.  I'm using EF 4.3.1 and have an entity call "apps_SystemInfo and one of the properties is call "RowVersion" which of course is a "TimeStamp"
and is set to "Fixed" Concurrent Mode. I'm trying to simulate a scenario for a ConCurrent exception but for some reason it is not working.  What I notice is that the second entity statment(ctx1) is being is being save but not the first(ctx).
Therefore SMTPPort is being set to 6000 on the sql record.  I need to catch  the concurrent exception and alert the user.  Any help  would be greatly appreciated.
private void UpdateSystemInfo()
using (AllocationEntities ctx = new AllocationEntities())
var d = (from c in ctx.apps_SystemInfo.Where(p => p.ID == 1)
select c).FirstOrDefault();
d.SMTPPort = 8000;
using (AllocationEntities ctx1 = new AllocationEntities())
var u = (from c in ctx.apps_SystemInfo.Where(p => p.ID == 1)
select c).FirstOrDefault();
u.SMTPPort = 6000;
ctx1.SaveChanges();
MessageBox.Show("Update inner update");
try
{ //This should trigger a ConcurrentException
ctx.SaveChanges();
MessageBox.Show("System infomation has been updated successfully", "Result");
catch (OptimisticConcurrencyException oCE)
MessageBox.Show(oCE.Message + " The record you're trying to update has change since you view it, the system will update your form with the changes", "ConCurrent Error!");
DisplaySystemInfo();
catch (Exception ex)
MessageBox.Show(ex.Message, "Exception Error");
Thanks
Anthony

Answer 1

Good catch by Olaf - in your inner loop you still refer to ctx instead of ctx1.
Also, I noticed a typo in the word 'information'.
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