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How to Avoid .NET Performance Problems

Why performance problems leave development?

Too many SQL Statements executed by the SharePoint API

Too many SQL Statements executed by the SharePoint API

Knowing that accessing the Items property on a SPList object queries the full list content every time allows you to make a better decision in accessing SharePoint data. You can either store the result of the first access to the Items property in a Collection or use alternative options like SPQuery. Check out my blog posts about SharePoint list access for more specific examples. This example is SharePoint specific but holds true for other Database Access Frameworks like popular O/R Mappers or the ADO.NET Entity Framework. Wrong usage leads to too many SQL Statements that happen under the hood.

My second example is hidden exceptions. With hidden exceptions I mean exceptions that are thrown but handled by the framework you are using, e.g.: standard .NET Libraries or 3rd Party libraries like NHibernate, Spring.NET, log4net, SharePoint … These exceptions never make it to your custom code and can therefore never be investigated whether there might something we can do about it. Each exception – intentional or not – causes a certain amount of overhead. Often “hidden” exceptions are caused by incorrect configurations of frameworks where the frameworks then fall back to a default setting. Knowing that there is a problem allows you to correct the settings and prevent unnecessary exceptions. Following screenshot shows some hidden exceptions.

Hidden Exceptions in 3rd Party Code and WCF Communication Layer

Hidden Exceptions in 3rd Party Code and WCF Communication Layer

I’ve seen hidden exceptions with configuration problems as described above as well as with deployment problems. When using ASP.NET Web Services the client proxy classes can be generated and deployed with your application. This often does not happen. If the compiled proxy classes are not deployed the .NET Framework creates proxy classes “on-the-fly” which causes massive overhead for the first request that accesses the web service proxy.

More Stories By Andreas Grabner

Andreas Grabner has been helping companies improve their application performance for 15+ years. He is a regular contributor within Web Performance and DevOps communities and a prolific speaker at user groups and conferences around the world. Reach him at @grabnerandi

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