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How do you call the AJAX modal extender control when a selected value of a dropdoown list has changed?

I'm currenlty working on a page where once the user selects a certain value from the dropdownlist, I need to display an AJAX Modal window for them to input information.  Can somone provide the syntax for calling the modal popup when the dropdowns selected value is changed to a number i specify.  Currently i have set the TargetControl to a hidden button, and on the SelectedIndexChanged event I'm using modal1.Show(), but nothing happens.

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this will give you complete picture of how to do and plus you will learn the mechanism behind that:


Forced accept.

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