Update

DataUtils/WebBrowser.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Runtime.InteropServices;
+using System.Windows.Forms;
+
+namespace DataUtils
+{
+	public enum OLECMDID
+	{
+		OLECMDID_OPTICAL_ZOOM = 63
+	}
+	public enum OLECMDEXECOPT
+	{
+		OLECMDEXECOPT_DODEFAULT = 0,
+		OLECMDEXECOPT_DONTPROMPTUSER = 2
+	}
+	[ComImport]
+	[Guid ("D30C1661-CDAF-11d0-8A3E-00C04FC9E26E")]
+	[InterfaceType (ComInterfaceType.InterfaceIsIDispatch)]
+	public interface IWebBrowser2
+	{
+		[DispId (0x000001F4)]
+		void ExecWB (
+			OLECMDID cmdID,
+			OLECMDEXECOPT cmdexecopt,
+			ref object pvaIn,
+			ref object pvaOut
+		);
+	}
+	public static class WebBrowserHelper
+	{
+		public static IWebBrowser2 GetWebBrowser2 (WebBrowser browser)
+		{
+			return browser.ActiveXInstance as IWebBrowser2;
+		}
+	}
+	public interface IWebBrowserPageScale
+	{
+		int PageScale { get; set; }
+	}
+}