Mike,
To get better XHTML format code, CuteEditior For ASP.NET handles this job on the server side. After you click the submit/save button, CuteEditor will automatically convert <p class=someClass>Hello world</p> to <p class="someClass">Hello world</p>
Please check the following example:
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asp wysiwyg html editor: http://cutesoft.net/ASP
asp.net Image Gallery: http://cutesoft.net/ASP.NET+Image+Gallery/default.aspx
Live Support: http://cutesoft.net/live-support/default.aspx