What are the best open source (open source and commercial) reporting tools for ASP.NET similar to Crystal Reports for ASP.NET?
Microsoft Reporting Services, free and included with SQL Server 2005 and 2008.
Of course, this is great if you need a separation of report design and application, which for Enterprise applications is a huge plus.
However, if what you want is to be able to create "in application" dashboards, where "you" design the reports and have limited parameters you expose to the user, then I suggest looking into "control" based charting vendors like TeeChart .
Pros/cons of each strategy: Crystal/Microsoft Reporting services will give you out of the box handling of things like report scheduling, export to excel and pdf, and separation between application and report design. The independent charting tools you can get give you better control, they render better on any size you need, easier to grammatically manipulate and can handle eye candy such as flash based (no flash charts in MS SSRS)
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