An optional page identifier that has to be matched by the validation and is written into ViewState. Ensures that spammers can't just capture the full post buffer and repost to another page.

This can be any unique value that the page uses like an ID or other page specific value that makes the particular request unique.

Highly recommended you set this.

public string UniquePageId { get; set; }

See also:

Class Captcha

© West Wind Technologies, 1996-2016 • Updated: 12/12/15
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