Hi Rory,
The datasource file is mainly used in WinForm application. It's used to
support drag drop creating UI. We can open the Data Sources Window to see
the effect of this file. (Please try to create a WinForm application and
add a web reference)
http://msdn.microsoft.com/en-us/library/6ckyxa83(VS.80).aspx
As to ASP.NET application the file is seldom used. If you don't like it you
can just delete it. But please note this file will be regenerated after
regenerating the proxy class. Of course, you don't have to include it in
your source control for your ASP.NET application.
Please let me know if you need further assistance.
Regards,
Allen Chen
Microsoft Online Community Support
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