Configuring HTTP Conne ctions in .NET framework

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Configuring HTTP Conne ctions
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Listing A7 Setting for HTTP Using Code
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Disabling HTTP Keep-Alives Adjusting the and properties of the class helps manage connection lifetime This is especially useful when working with load-balanced server farms Unfortunately, not all load-balanced scenarios support HTTP Keep-Alives Sometimes the only way to achieve an even load balance is to turn off the use of HTTP Keep-Alives This can be achieved a number of ways Many places affect whether HTTP Keep-Alives is used For example, HTTP Keep-Alives can be set by Internet Information Services (IIS) Figure A2 shows the HTTP Response Headers feature available in IIS 70 on Windows Server 2008 and Windows Vista with Service Pack 1 The IIS 70 setting for HTTP Keep-Alives can also be set using the command line The following command shows how to disable HTTP KeepAlives for IIS 70 using the command line This was the only way to disable HTTP Keep-Alives in IIS 70 on Window Vista prior to SP1
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HTTP Keep-Alives can also be enabled or disabled using the property of the binding element Listing A8 shows how to disable HTTP Keep-Alives on the binding element
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Listing A8 on Binding Element
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Appendix: Advanced Topics
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Figure A2 IIS 70 settings for HTTP Keep-Alives
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HTTP Keep-Alives can also be disabled in con guration using a custom binding element binding based on the Listing A9 shows how to disable HTTP Keep-Alives using a custom binding in con guration
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Listing A9 Setting Using Element
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The last approach, which was mentioned previously, is to set the on the class Setting the value to 0 means that connections will be closed after each request This forces each
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Configuring TCP Conne ctions
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new request to obtain a new connection This has the same effect as disabling HTTP Keep-Alives
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Increasing Number of Connections The property on the class speci es the instance can open The maximum number of connections the default value is set based on the host environment The value is set to 2 coninstance in client and 10 connections per nections per instance in ASPNET server environments This is based on property of the class the property may increase throughput in Increasing the server-to-server communication or multithreaded client scenarios Listing A10 shows how to set the maximum number of connections using con guration
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Listing A10 Setting for HTTP Using Configuration
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Configuring TCP Connections
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Unlike HTTP connections, WCF does not leverage classes in the NET Framework to manage TCP connection lifetime Instead, WCF uses a connection pool to cache connections The connection pool can be managed using the property of the binding element The property returns an class This class has three instance of the properties that help manage connections in the connection pool: , , and
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Recycling Idle Connections The property speci es how low a connection can remain idle in the connection pool before it is closed and removed from the connection
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pool The default value is set to two minutes Setting this value lower can be useful in load-balancing scenarios by increasing the likelihood that idle connections will be recycled
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Adjusting Connection Lifetime The property speci es how long a connection can be active before it is eligible for recycling After the lifetime is elapsed, idle connections can be closed and removed from the connection pool The default value is set to ve minutes Setting this value lower can be useful in load balancing scenarios by decreasing the time before connections can be rebalanced across a server farm Increasing Number of Connections The property speci es the maximum number of connections that can be cached in the connection pool By default the value is set to 10 connections Increasing this value may improve performance and scalability in server-to-server or multithreaded client communication scenarios
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Using LINQ with WCF
Language Integrated Query (LINQ) is one of the new technologies available in NET Framework 35 that allows for data to be queried using C# or Visual Basic NET Traditionally, data is queried by an application using a string expression, such as SQL or XPath query expressions, without the bene ts of compile time checking or IntelliSense support LINQ enables these capabilities by making a query a rst-class language construct LINQ supports several data sources including SQL Server databases, XML documents, ADONET DataSets, and NET objects LINQ provides a single mechanism for querying data across these different data sources Using LINQ can help bridge the world of data and the world of objects
Exposing LINQ-to-SQL Entities LINQ-to-SQL refers to the features in LINQ that expose relational data stored in SQL Server as objects This is great for mapping entities stored within tables in the database to objects within an application This is often