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asp.net button click event(On Click) fire two times automatically in mozilla firefox.why?

when running asp.net c# website in mozilla firefox and when a button is clicked it always fire two times automatically even after giving code for button disable after one click.

when running asp.net c# website in mozilla firefox and when a button is clicked it always fire two times automatically even after giving code for button disable after one click.

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Thank You very much Ms.Aswini.sharanya. This helps me a lot.