Thanks for your help.
Can you give me a hint?
System.InvalidOperationException: Operation is not valid due to the current state of the object. at Microsoft.Reporting.WinForms.ReportViewer.PrintDialog() at SNT.ReportViewerTillReconcilliation.ctlReportViewerTill_RenderingComplete(Object sender, RenderingCompleteEventArgs e) at Microsoft.Reporting.WinForms.ReportViewer.OnRenderingCompleteUI(ProcessThreadResult result, PostRenderArgs postRenderArgs)