Knowledge Base

PRB: WebBrowser Problems When Refreshing in TitleChange Handler

Article ID: 179229

Article Last Modified on 8/18/2005

Microsoft Internet Explorer 3.02
Microsoft Internet Explorer 4.0 128-Bit Edition
Microsoft Internet Explorer 4.01 Service Pack 2
Microsoft ActiveX SDK
Microsoft Internet Client Software Development Kit 4.0
Microsoft Internet Client Software Development Kit 4.01

This article was previously published under Q179229

SYMPTOMS

When an application using the WebBrowser control makes a call to the Refresh method of the WebBrowser control in an event handler for the TitleChange event, various problems occur.

Internet Explorer 3.02 crashes with an access violation. In the other versions of Internet Explorer mentioned at the beginning of this article, an infinite loop occurs and the browser hangs.

CAUSE

In Internet Explorer 4.x this behavior is by design. Calling Refresh from within a TitleChange event handler causes the WebBrowser control to fire a TitleChange event. This infinite loop occurs if you call Refresh in handlers for many of the WebBrowser events.

RESOLUTION

Do not call Refresh within the TitleChange event handler for the WebBrowser.

STATUS

This behavior is by design.

MORE INFORMATION

Steps to Reproduce Behavior

In Visual Basic, drop a WebBrowser control on a form.
Add a button.
Add the following code to the click event handler for the button:
```
WebBrowser1.Navigate "http://www.microsoft.com"
						
```
Add the following code to the WebBrowser's TitleChange event handler:
```
Webbrowser1.Refresh
						
```
Run the project, and click the button.
In Internet Explorer 3.02 the application will crash. In the other versions of Internet Explorer mentioned at the beginning of the article, an infinite loop occurs.

Keywords: kbprb KB179229