[C#] mazanie nakresleneho objektu

[Worko]

Anduril, napisal ssom co si mi poradil a compiler vypisal:
D:\_zadanieGrafika\gGraphics\Form1.cs(20): A field initializer cannot reference the nonstatic field, method, or property 'gGraphics.Form1.bmp'

nepaci sa mu premenna bmp, teda neprelozi riadok
Graphics g = Graphics FromImage(bmp);