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)