using System; namespace EasyChart { public static class ProPackage { private static bool? s_isInstalled; public static bool IsInstalled { get { if (s_isInstalled.HasValue) return s_isInstalled.Value; var t = Type.GetType("EasyChart.Pro.EasyChartProBootstrap, EasyChart.Pro.Runtime"); s_isInstalled = t != null; return s_isInstalled.Value; } } } }