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Asked: 2026-05-12T00:00:04+00:00

I have a web application that works in our stage/test environment fine but once

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I have a web application that works in our stage/test environment fine but once we moved it to our production environment something weird happens. All the control ids change. For example a label went from ctl00_cphMainContent_lblPetName to _ctl0_cphMainContent_lblPetName. Why would this happen? What could cause something like this to happen. The only two differences I know of are the production environment has HTTPS and I’ve disabled debugging.

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1 Answer

  1. Editorial Team

    Your web.configs differ. Behaviour of the client ID generation depends on EnableLegacyRendering. Please review xhtmlConformance element of your web.config. If it Legacy you will get “_ctl”, if not – “ctl”.

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