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GoDiagram for .NET from Northwoods Software

Printable Version

WebBrowserControl for the .NET Framework 1.1
By Paulo Morgado


This article presents an implementation of a web browser control for the .NET Framework 1.1. It's more of a reference for what it does than how it's done.

This is not the result of my work but a collection of all the help I got along the way.


The need for this control came from a project I'm working in. It's a smart client Windows application that host application in web browsers and interacts with the pages.

What does it do?

This control is, mainly, an interop to the following COM interfaces:

Interface Description Usage
IWebBrowser2 This interface enables applications to implement an instance of the WebBrowser control (Microsoft ActiveX control) or control an instance of the InternetExplorer application (OLE Automation). Note that not all of the methods listed below are supported by the WebBrowser control. Main web browser operation.
DWebBrowserEvents2 This interface designates an event sink interface that an application must implement in order to receive event notifications from a WebBrowser control or from the Microsoft Internet Explorer application. Note that not all of the events listed below are supported by the WebBrowser control. Handling web browser events.
IDocHostUIHandler This custom interface enables an application hosting the WebBrowser Control or automating Microsoft Internet Explorer to replace the menus, toolbars, and context menus used by MSHTML. Showing the context menu, translating keys and URLs.
IDocHostShowUI A host can supply mechanisms that will show message boxes and Help by implementing the IDocHostShowUI interface. Showing message boxes (alert and confirm) and help.
IOleCommandTarget The IOleCommandTarget interface enables objects and their containers to dispatch commands to each other. For example, an object's toolbars may contain buttons for commands such as Print, Print Preview, Save, New, and Zoom. Handling script errors.

Using the code

The MSHTML primary interop assembly (instaled with the .NET Framework SDK Version 1.1 - usually %ProgramFiles%\Microsoft.NET\Primary Interop Assemblies) is needed to interop with HTML stuff.

Other than that, just add the control to your form or user control.

Known Issues

Along the way, I lost the ability to use the designer.

Download Source

Thanks To Igor Tandetnik, Joao Melo, Luis Abreu, Oleg Mihailik and many more.