C# How to fill database values into textboxes when combobox selected index changed

Thank you so much ! <3

Thank u

Amazing video

Man thank You 1000 000 times You saved my life.This is exactly what I have been looking for for a long time.

how can I do the same but using a text box?

Really appreciate that

'Operation is not valid due to the current state of the object.' comboboxtan seçtiğim zaman bu hatayı alıyorum hocam getiremiyorum veriyi sebebi nedir

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