Performance Considerations | Visual BasicR. NET Unleashed


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	Visual Basic .NET Unleashed By Paul Kimmel
	Table of Contents

	Chapter 19. ASP.NET Web Programming

Performance Considerations

The help topic "Developing High-Performance ASP.NET Applications" (available at ms-help://MS.VSCC/MS.MSDNVS/cpguide/html/cpcondevelopinghigh-performanceaspnetapplications.htm) provides options that are worth exploring. I won't repeat that information in its entirety, but the list that follows is provided for quick reference.

Disable the session state unless you are using it. Add the enableSessionState= "false" attribute to the page directive to disable the session state.
You can store session information in a variety of in-process and out-of-process providers. An example of an in-process provider is the Session object; an example of an out-of-process provider is SQL Server. Choose your session information provider accordingly . Small data that you need quick access to can be stored with an in-process provider. If the state must be maintained even in the event of a crash, you need an out-of-process provider like SQL Server.
Use Page.IsPostBack to keep the number of round trips to the server to a minimum.
Use server controls appropriately. The Page attribute EnableViewState allows server controls to repopulate their values without your having to write code, but this feature incurs a performance penalty.
Multiple calls to Response.Write can concatenate strings faster than performing concatenation and having a single call to Response.Write.
Avoid using exceptions to control the flow of control. If you can handle an anticipated error condition, use conditional statements, but don't avoid using exceptions.
Declare all variables explicitly, avoiding late binding. Option Strict On will enforce this constraint.
Port COM components to .NET (although COM interop supports using COM components in .NET).
Use stored procedures for scalable data access and the SqlReader for forward-only fast data access.
Use output caching when possible.
Enable Web gardening on multiprocessor computers.
Build your application with debugging off before deploying it.


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