ASP.Net AJAX NoBot extender control also belongs to AJAX Control Toolkit provided by Microsoft having inbuilt functionality that performs the automatic caching of client's IP address and its postback activities on ASP.Net web pages. AJAX NoBot extender control provides the functionality similar to CAPTCHA very popular these days. Do you know? What is the purpose to use such validations on web pages? A simple explanation to this is, protect the web forms from automated submission by auto pilot softwares. These softwares are purposely used for spamming that lead to downtime of web sites. AJAX NoBot extender control checks such kind of spamming behavior of web site user that ensures whether the user is human or intelligent software. Following are the features of ASP.Net AJAX NoBot extender control:
AJAX NoBot control checks whether all the client side javascript is working or has been disabled by the spamming software. It performs the javascript client side calculation that returns a numeric result as part of postback to verify the NoBot validation.
AJAX NoBot extender verifies the delay in requests sent by the user within a given time span. E.g.: A human cannot fill up and submit the web form within a minute.
AJAX NoBot extender also checks the number of requests from a single IP within a specified time span. E.g.: A human cannot fill up and submit the same web form five times in a minute.


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