Taking my inspiration from Jan Tielen's control http://www.codeplex.com/smarttools/Wiki/View.aspx?title=Autocomplete%20Text%20Field, I decided to build my own with the difference that
- The field is a lookup field (derived from SPFieldLookup)
- You don't need to install the ASP.NET AJAX Framework
I did it that way because in some environments, it's often tricky to change the production system by installing the AJAX framework and/or some service packs. This component embedds "manual" AJAX calls towards the SharePoint Web Service so that you don't need to install anything special to make it working.
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