Invalid PostBack or callback argument Solution

When you use updatepannel in ajaxtookite for asynchronous updates, the following pop-up window will appear during the runtime, prompting you to provide the following information. Then, if you click OK, nothing will happen. The solution is listed below:

Invalid PostBack or callback argument.
Event validation is enabled using <pages
Enableeventvalidation = "true"/> in configuration or <% @ page
Enableeventvalidation = "true" %> in a page. For security purposes,
This feature verifies that arguments to PostBack or callback events
Originate from the server control that originally rendered them. If
The data is valid and expected, use
Clientscriptmanager. registerforeventvalidation method in order
Register the PostBack or callback data for validation.

Solution:
<% @ Page ...... %> Add the attribute enableeventvalidation = "false" to the statement"