c# - Cannot implicitly convert from dialog result to bool -

i'm trying reproduce code wpf winforms (this code works inside wpf)

public static bool? showsettingsdialogfor(icustomcustomer) {    if (cust basiccustomer)    {       return (new bcustomersettingsdialog()).showdialog();    } } 

i'm getting compile error message

cannot implicitly convert type 'system.windows.forms.dialogresult' 'bool?'

change

return (new bcustomersettingsdialog()).showdialog() == dialogresult.ok;