Code:
// für den Using Teil
using CrystalDecisions.CrystalReports.Engine;
using CrystalDecisions.Shared;
// variablen deklaration
private CrystalDecisions.Windows.Forms.CrystalReportViewer crystalReportViewer1;
private CrystalDecisions.CrystalReports.Engine.ReportDocument reportDocument1;