"Invalid postback or callback argument" Problem
In case you get the following exception while trying to run an ASP.NET application, the solution is not as simple as setting the "enableEventValidation" configuration to "false" all the time. 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...