vb.net 2010 - Change the Bold properties -

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i have problem in code:

if richtextbox1.font.bold = true     richtextbox1.font.bold = false else    richtextbox1.font.bold = true end if

here problem:"richtextbox1.font.bold = false" (this property readonly), need help.

here's simple example:

private sub button1_click(sender system.object, e system.eventargs) handles button1.click     if richtextbox1.font.bold = true         richtextbox1.font = new font(richtextbox1.font, fontstyle.regular)     else         richtextbox1.font = new font(richtextbox1.font, fontstyle.bold)     end if end sub

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