佢話你"物件參考相未設定為物件實質個體"
即係
dim Button as Windows.Forms.Button<===將Button 宜告為Windows.Forms.Button類型,但並非物件。佢為Nothing
同
dim Button as <b>New</b> Windows.Forms.Button<===將Button宜告為Windows.Forms.Button物件。
既分別。
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亦即係同你講"燈膽燒左",你剩係知有個燈膽燒左,係咩類型既燈膽、咩燈你都唔知
但同你講"睡房既燈膽燒左",咁你就會明係邊支燈既燈膽燒左。重係咩類型既燈膽