Is it possible to change the appearance of a Windows Forms dialog box?

Question

Windows Forms

Something like this: rounded corners and a more modern interface

Answer 1

In my opinion, you just need to choose another project type - WPF.

Answer 2

To implement such an interface on Winforms, use additional libraries: Devexpress, Telerik, Infragistic - one of the popular commercial libraries, all have free trial versions for experiments