I am using two dropdown list and one GridView.
I have taken two update panels.
In first update panel i have placed second dropdownlist in which data is
coming based on the value selected in the first dropdown list
In second update panel i have placed gridview in which data is coming
based on the value selected in the second dropdown list
There is a link button in one column of gridview but when I am clicking
the link button First time nothing is happening and second time I am
getting the error message:
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 the
ClientScriptManager.RegisterForEventValidation method in order to
register the postback or callback data for validation