The Acumen software design blog provides you with helpful articles about Crystal Report.

Several web sites provide a good overview.

Official Crystal Reports Overview

Crystal Reports Wikipedia

Move Crystal Report between Servers

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Crystal Report Object reference not set to an instance of an object. Exception Details: System.NullReferenceException: Object reference not set to an instance of an object. CrystalReportSource1.ReportDocument.ExportToHttpResponse(ExportFormatType.PortableDocFormat,…