This question is in my head for way too long. How this guy made a form with a custom border and custom controls without a ".dll" file or something like that. It's just a ".exe".
My question is simple: How can I do this to my forms?
Not sure what you mean without dll file but I would recommend checking out Drawing Custom Borders in Windows Forms
The fact that it is just a dll doesn't mean it doesn't rely on a 3rd party application. The developer could have merged them in the dll, you can check if there are resouces/assmblies merged into the dll using ILMerge or if it is a WPF app, using other means .
Other than using a 3rd party control or using GDI+ to custom draw your form/controls, there's no out of the box support for skins/themes in WinForm controls, except for what OS supports.
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