AJAX ModalPopupExtender Error Issue RRS feed

  • Question

  • User-790433925 posted


    I have a web application that was developed in Visual Studio 05 in a 32bit Win XP environment a few years ago without any issues.  Currently, I'm running VS 08 in a Win7 64 bit environment and need to make a minor modification to the web application but am receiving a build error on the following control:


    Error: 'AjaxControlToolkit.ModalPopupExtender' does not contain a definition for 'ChangeVisibility' and no extension method 'ChangeVisibility' accepting a first argument of type 'AjaxControlToolkit.ModalPopupExtender' could be found (are you missing a using directive or an assembly reference?)

    Not sure why this is happening even though all related references have been made in VS 08.

    Any recommendations or suggestions would be most appreciated.

    Thank you in advance.

    Friday, May 23, 2014 2:37 PM


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