You want the RAD wonderfulness of a visual web part, but it needs to be deployed as a Sandboxed solution. Problem? No, SharePoint powertools for visual studio to the rescue! http://goo.gl/pQ9ct There are a couple limitations, read the above page, nothing major. e.g. 1. Javascript debugging is not supported 2. Debugging asp.net code is not supported. 3. Use of <% Assembly Src= is not supported I understand it does it by adding the markup as an embedded resource, but I haven't actually tried it...