While making signup page I got this error

Severity Code Description Project File Line Suppression State
Error CS1061 'SignupScreen' does not contain a definition for 'BtnSubmit_Click' and no accessible extension method 'BtnSubmit_Click' accepting a first argument of type 'SignupScreen' could be found (are you missing a using directive or an assembly reference?) WpfSignupscreen D:\Visual Studio Work\WpfSignupscreen\WpfSignupscreen\SignupScreen.xaml 23 Active

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