The implementation method of GDI double buffering of net WINFORM

Sometimes flash occurs when performing continuous GDI + operations in the form. In addition to modifying the parameters of the form, the problem of refreshing itself should be solved. Double buffering may come from this way.

Method 1:

Draw on the bitmap with GDI, and then rebuild the bitmap

Bitmap bt = new Bitmap(510, 510);
Graphics g = Graphics.FromImage(bt);

g.DrawEllipse(Pens.Red, 100, 100, new Random().Next(1, 60), 50);
g.Dispose();
gb.DrawImage(bt,0,0);
gb.Dispose();