WPF designer issues : XDG0008 The name “NumericTextBoxConvertor” does not exist in the namespace “clr-namespace:PulserTester.Convertors”

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I just want to reiterate a solution that Bradley Uffner mentioned buried in the comments above.

  1. Close Visual Studio

  2. Delete the hidden .vs folder

  3. Open Visual Studio and rebuild your project

Keep in mind that this is a very generic error that has multiple causes and solutions, so this may not work for you, but it’s definitely worth a shot since I know it has worked for me in the past on several occasions.

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)