If you are (un) lucky like me then you may run into gettin this error on IIS server asp.net web apps/asmx web services. Its a known issue and has a resolution documented in kb article @ http://support.microsoft.com/kb/821268.
The resolution revolves around fine tuning machine.config parameters.
To improve your asp.net web app performance do read http://msdn.microsoft.com/en-us/library/ms998549.aspx
You can download VS 2008 sp1 and .Net 3.5 sp1 @
This release has major improvements on WCF and WF.
Brief overview avaialble @ download page says:
.NET Framework version 3.5 Service Pack 1 provides the following new features and improvements:
- ASP.NET Dynamic Data, which provides a rich scaffolding framework
that enables rapid data driven development without writing code, and a
new addition to ASP.NET AJAX that provides support for managing browser
history (back button support). For more information, see What’s New in ASP.NET and Web Development.
- Core improvements to the CLR (common language runtime) that include
better layout of .NET Framework native images, opting out of
strong-name verification for fully trusted assemblies, improved
application startup performance, better generated code that improves
end-to-end application execution time, and opting managed code to run
in ASLR (Address Space Layout Randomization) mode if supported by the
operating system. Additionally, managed applications that are opened
from network shares have the same behavior as native applications by
running with full trust.
- Performance improvements to WPF (Windows Presentation Foundation),
including a faster startup time and improved performance for Bitmap
effects. Additional functionality for WPF includes better support for
line of business applications, native splash screen support, DirectX
pixel shader support, and the new WebBrowser control.
- ClickOnce application publishers can decide to opt out of signing
and hashing as appropriate for their scenarios, developers can
programmatically install ClickOnce applications that display a
customized branding, and ClickOnce error dialog boxes support links to
application-specific support sites on the Web.
- The Entity Framework is an evolution of the existing suite of
ADO.NET data access technologies. The Entity Framework enables
developers to program against relational databases in according to
application-specific domain models instead of the underlying database
models. For more information, see Getting Started with the Entity Framework.
The Entity Framework introduces some additional features, including
support for new SQL Server 2008 types, default graph serialization of
Entities, and the Entity Data Source. This release of the Entity
Framework supports the new date and file stream capabilities in SQL
Server 2008. The graph serialization work helps developers who want to
build Windows Communication Foundation (WCF) services that model full
graphs as data contracts. The Entity Data Source provides a traditional
data source experience for ASP.NET Web application builders who want to
work with the Entity Framework.
- LINQ to SQL includes new support for the new date and file stream capabilities in SQL Server 2008.
- The ADO.NET Data Services Framework consists of a combination of
patterns and libraries, which enable data to be exposed as a flexible
REST (Representational State Transfer)-based data service that can be
consumed by Web clients in a corporate network or across the Internet.
The ADO.NET Data Services Framework makes data service creation over
any data source. A conceptual view model of the underlying storage
schema can easily be exposed through rich integration with the ADO.NET
Entity Framework. Services created by using the ADO.NET Data Services
Framework, and also compatible Windows Live (dev.live.com) services,
can be easily accessed from any platform. For client applications that
are running on Microsoft platforms, a set of client libraries are
provided to make interaction with data services simple. For example,
.NET Framework-based clients can use LINQ to query data services and a
simple .NET Framework object layer to update data in the service.
- Windows Communication Foundation now makes the DataContract
Serializer easier to use by providing improved interoperability
support, enhancing the debugging experience in partial trust scenarios,
and extending syndication protocol support for wider usage in Web 2.0
- The .NET Framework Data Provider for SQL Server (SqlClient) adds
new support for file stream and sparse column capabilities in SQL