How to remove black borders from a button?

Question

C++ / C#

How to remove black borders from a button? What would an image be without these borders

Answer 1

In the method, or in the properties window for this button, set the
InitializeComponent() properties

this.SetButtonPublic.FlatAppearance.BorderSize = 0;
this.SetButtonPublic.FlatStyle = System.Windows.Forms.FlatStyle.Flat;