Added tray icon

DnsServerTrayIcon/BuildAssemblyExtensions.cs

@@ -0,0 +1,39 @@
+using System;
+using System.IO;
+using System.Reflection;
+
+namespace DnsServerTrayIcon
+{
+    public static class BuildAssemblyExtensions
+    {
+        public static DateTime GetLinkerTime(this Assembly assembly, TimeZoneInfo target = null)
+        {
+            var filePath = assembly.Location;
+            const int c_PeHeaderOffset = 60;
+            const int c_LinkerTimestampOffset = 8;
+
+            var buffer = new byte[2048];
+
+            using (var stream = new FileStream(filePath, FileMode.Open, FileAccess.Read))
+                stream.Read(buffer, 0, 2048);
+
+            var offset = BitConverter.ToInt32(buffer, c_PeHeaderOffset);
+            var secondsSince1970 = BitConverter.ToInt32(buffer, offset + c_LinkerTimestampOffset);
+            var epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
+
+            var linkTimeUtc = epoch.AddSeconds(secondsSince1970);
+
+            var tz = target ?? TimeZoneInfo.Local;
+            var localTime = TimeZoneInfo.ConvertTimeFromUtc(linkTimeUtc, tz);
+
+            return localTime;
+        }
+
+        public static string GetBuildVersion(this Assembly assembly)
+        {
+            var linkTimeLocal = assembly.GetLinkerTime(TimeZoneInfo.Utc);
+            return new Version(1, 0, 0,
+            ((int)new TimeSpan(linkTimeLocal.Hour, linkTimeLocal.Minute, linkTimeLocal.Second).TotalSeconds) / 2).ToString();
+        }
+    }
+}