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Im getting that error when try to call a __doPostBack on one of my pages, every page that i have in the project use __doPostBack function but in this particular page im getting that Javascript error.
i was looking in the internet and the only thing i read is that this error happends when i have a unclose tag but i review the site and its ok.
Error: __doPostBack is not defined Source File: htt://localhost:99/ProjectName/Disable.aspx Line: 1
Try calling the RegisterRequiresPostBack method. It should make the ASP.NET runtime include the __doPostBack code.