you can use GDI+ to generate images on the fly, seeASP.NET
Create Snazzy Web Charts and Graphics On the Fly with the .NET Framework
http://msdn.microsoft.com/msdnmag/issues/02/02/ASPDraw/default.aspx
Create Snazzy Web Charts and Graphics On the Fly with the .NET Framework
http://msdn.microsoft.com/msdnmag/issues/02/02/ASPDraw/default.aspx
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