The MuddledHyperlink control is intended to make life difficult for spammers who pilfer your site for all email addresses.  It replaces the Hyperlink control for ASP.NET. 

When a hyperlink is downloaded to the client, the actual link is modestly scrambled and is not descrambled until the user clicks on the link.  Each visit to the page, the control selects a random algorithm to use when scrambling the email address

Here's a demo below.

A setup package can be downloaded from here for ASP.NET 1.1 or here for ASP.NET 2.0.  Execute the setup package as you would any other installation.  Answer the prompts during the installation.  Most users should be able to take the defaults.

After the control has been downloaded, you need to add it to your toolbox.  Go into Visual Studio and design a web form or user control.  Right-click in the control toolback and select “add/remove items”.  You should be able to checkthe obscure hyperlink control from the list (see picture below).  Press the OK button and the control should be added to your toolbox.

That's it, you're ready to go.

The muddled hyperlink control is derived from System.Web.UI.WebControls.HyperLink class  It should function the exact same way, so consult the .NET documentation for more information.  The control, at render time, moves and scrambles the contents of the NavigateUrl property to a new attribute called onClick.  Some javascript is inserted to descramble the Url when the user clicks on the hyperlink.  I have not tested this with other browsers aside from Microsoft IE, but it should work fine in Javascript enabled browsers.

Good luck, if you encounter any problems or can give me feedback, email me using the link above.

The muddled hyperlink is freeware.  For you legal junkies, here's the license agreement: