c# - How to stop my bold/italic/underline options changing the text's font back to the default font and size -

in application, have feature allows user change bold/italic/underline styles of text. however, have noticed when user makes text bold, reverts text default size , font , makes bold. undesired mean user have change font , size of text again, undesirable.

currently, code making text bold within application's richtextbox is:

richtextboxprintctrl1.selectionfont = new system.drawing.font(richtextboxprintctrl1.font,             richtextboxprintctrl1.selectionfont.style ^ fontstyle.bold); 

where going wrong? make text bold, reverts text default size , font... however, colour unaffected.

try using sample code provided msdn:

  system.drawing.font currentfont = richtextboxprintctrl1.selectionfont;   system.drawing.fontstyle newfontstyle;    if (richtextboxprintctrl1.selectionfont.bold == true)   {      newfontstyle = fontstyle.regular;   }   else   {      newfontstyle = fontstyle.bold;   }    richtextboxprintctrl1.selectionfont = new font(      currentfont.fontfamily,       currentfont.size,       newfontstyle   ); 

edit

as per @abalter suggestion put inside answer sample code write in comment below. code better match asked in question.

if (richtextboxprintctrl1.selectionfont.bold == true) {     newfontstyle = currentfont.style ^ fontstyle.regular; } else {     newfontstyle = currentfont.style | fontstyle.bold; }