ASP.NET allows you to store information in a HiddenField control, which renders as a standard HTML hidden field. A hidden field does not render visibly in the browser, but you can set its properties just as you can with a standard control. When a page is submitted to the server, the content of a hidden field is sent in the HTTP form collection along with the values of other controls. A hidden field acts as a repository for any page-specific information that you want to store directly in the page.
A HiddenField control stores a single variable in its Value property and must be explicitly added to the page.
In order for hidden-field values to be available during page processing, you must submit the page using an HTTP POST command. If you use hidden fields and a page is processed in response to a link or an HTTP GET command, the hidden fields will not be available.
Note:
It is easy for a malicious user to see and modify the contents of a hidden field. Do not store any information in a hidden field that is sensitive
A HiddenField control stores a single variable in its Value property and must be explicitly added to the page.
In order for hidden-field values to be available during page processing, you must submit the page using an HTTP POST command. If you use hidden fields and a page is processed in response to a link or an HTTP GET command, the hidden fields will not be available.
Note:
It is easy for a malicious user to see and modify the contents of a hidden field. Do not store any information in a hidden field that is sensitive
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