Show documentation version in footer

docs/src/Utilities/VersionUtilities.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Reflection;
+using System.Text;
+
+namespace Docs.Utilities
+{
+    public static class VersionUtilities
+    {
+        public static string GetVersion()
+        {
+            return GetVersion(typeof(VersionUtilities).Assembly);
+        }
+
+        private static string GetVersion(Assembly assembly)
+        {
+            if (assembly == null)
+            {
+                return "?";
+            }
+
+            try
+            {
+                var info = FileVersionInfo.GetVersionInfo(assembly.Location);
+                return info.ProductVersion ?? "?";
+            }
+            catch
+            {
+                return "?";
+            }
+        }
+    }
+}