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HiddenField

This control enables a developer to store a non-displayed value.

The HiddenField control is used to store a value that needs to be persisted across posts to the server. It is rendered as an <input type= "hidden"/> element. Normally view state, session state, and cookies are used to maintain the state of a Web Forms page. However, if these methods are disabled or are not available, you can use the HiddenField control to store state values. Note that because the value of a HiddenField is rendered to the client browser, it is not suitable for storing security-sensitive values. To specify the value for HiddenField a control, use the Value property. You can provide a routine that gets called everytime the value of the HiddenField control changes between posts to the server by creating an event-handler for the ValueChanged event.