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IIS server crashes

I am making a process which will iterate through collections. I have two collections A and B. Suppose there are 200 rows in each collection. It need to compare each row of collection A to each row of itself and same with collection B. Then it compares each row of collection A with each row of collection B which is a lot of calculation. IIS server crashes after sometime like after 10,000 iterations but in my case there will be 120,000 iterations. What should I do? When you iterate through collections are they in memory or every time you iterate it gets them from database. If it gets them from database each time then how can I save them in memory and then iterate on them?

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Dear Fahad,

Can you please attach the Event Viewer error message? To start Event Viewer by using the Windows interface:

1. Click the Start button.

2. Click Control Panel.

3. Click System and Maintenance.

4. Click Administrative Tools.

5. Double-click Event Viewer.

6. Click Windows Logs.

7. Click Application.

8. Look for the error message.

Meanwhile, as the error might be a timeout problem, please refer to links below for further information.

http://kb.bizagi.com/Knowledgebase/HOWTO-Configure-the-session-timeout

http://kb.bizagi.com/Knowledgebase/Time-limit-for-the-asynchronous-activity-has-expired