Function for checking if .net Framework installed

        private static bool IsNetFrameWork45()
        {
            //            Following are the different version for .Net 4.0 
            //4.0.30319.1 = .NET 4.0 RTM
            // 4.0.30319.269 = most common .NET 4.0 version we're seeing in the data collected from our users
            // 4.0.30319.544 = another .NET 4.0 version that a small portion of our users have installed
            // 4.0.30319.17626 = .NET 4.5 RC
            // 4.0.30319.17929 = .NET 4.5 RTM
            // 4.0.30319.18010 = current version on my Windows 8 machine
            Assembly assembly = typeof(System.String).Assembly;
            System.Diagnostics.FileVersionInfo fvi = System.Diagnostics.FileVersionInfo.GetVersionInfo(assembly.Location);
            if (fvi.FileMajorPart != 4) return false;
            if (fvi.ProductPrivatePart < 17626) return false;
            return true;
        }