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Assembly: Microsoft.ReportViewer.WinForms (in microsoft.reportviewer.winforms.dll)
Calling the Reset method cancels any current rendering and resets the ReportViewer control to its default state. The existing LocalReport object is replaced with a new instance.
Because the LocalReport object is replaced with a new instance when Reset is called, any reference to the SubreportProcessing event handler is removed. You must reinstate the SubReportProcessing event handler after calling Reset to handle sub-report processing events.