Web Parts and Web Services

I am working with Visual Studio 2008 and SharePoint 2007. I have create开发者_运维百科d a web part , a web user control that pulls data from a web service (binding a DropDownlist from web service) has been wrapped in my Web Part. When I deploy my web part it doesn't show me the data pulled from web service (Empty DropDownList). please advice how to use web parts that interacts with external web services.

Thanks a lot.

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http://support.microsoft.com/kb/826994
This should have everything you need.