What's the best way to transfer a large dataset over an ASMX web service?

We had this exact business scenario a few years ago, and I'll tell you what we did.

I'd recommend offloading the task to SSRS, which handles long-running queries without a problem. You can build a report with your report builder, then use your . NET app to invoke the SSRS web services run your report and export the results back in Excel format (as a byte array).

See this page for sample code using the . Asmx service, and this page for invoking SSRS with WCF.

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