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Assembly: Microsoft.ReportViewer.WebForms (in microsoft.reportviewer.webforms.dll)
This is passed to the DrillthroughEventHandler delegate when a Drillthrough event occurs.
You can examine the value of the ReportPath property and supply data corresponding to that report.
You can call the GetParameters method of the drillthrough report supplied in the targetReport parameter to examine the values of parameters being passed from the main report to the drillthrough report and to supply data corresponding to the parameter values.