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Ali Raza Zaidi

A practitioner’s musings on Dynamics 365 Finance and Operations

Session vs ViewState

January 15, 2008 by alirazazaidi

Session State is useful for storing values that must be persisted across
multiple pages by the same user. ViewState is useful for storing
serializable data that must be persisisted across PostBacks by a single
page. If you use Session State, the value you insert will remain in memory
until (1) The Session times out, or (2) Your code removes it. If you use
ViewState, the value you insert will remain in ViewState until the user
requests a different page.

ViewState stores data betwen PostBacks by putting it into a hidden form
field on the client HTML doc. when the doc is Posted Back, the values are
read from the hidden form field and stored in memory until the page has
finished processing. If ViewState is particularly large (and I’m talking KBs
here, not 6 bytes), it can negatively affect the speed at which the HTML doc
is downloaded by the browser.

Use the right tool for your job. I think after my explanation, it should be
obvious that you would want to use ViewState in your specific case.

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I am Dynamics AX/365 Finance and Operations consultant with years of implementation experience. I has helped several businesses implement and succeed with Dynamics AX/365 Finance and Operations. The goal of this website is to share insights, tips, and tricks to help end users and IT professionals.

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Content published on this website are opinions, insights, tips, and tricks we have gained from years of Dynamics consulting and may not represent the opinions or views of any current or past employer. Any changes to an ERP system should be thoroughly tested before implementation.

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