Message in Japanese (日本語)
System.Web.Mobile.MobileCapabilities および System.String を引数とし、System.Boolean を返すデバイス機能 '<var>X</var>'、または非静的パブリック メソッド '<var>X</var>' が見つかりません。
Unlocalized message
Can find neither a device capability named '<var>X</var>' nor a public non-static method on the page named '<var>X</var>' that returns a System.Boolean and takes System.Web.Mobile.MobileCapabilities and System.String as arguments.
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