Load Crystal Report from Windows Form to SAP B1

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SAP

Hi all visitors,

I dropped AxCrystalActiveXReportViewer on my window form(form1).i define the startup object in(Project Property->Startup Object) to my form1.it runs well. i mean it can display report.then i changed the startup object to SubMain because i want to preview my report when i click one button in SAP. when i click on print button to display my report on form1,it display an error like that "An error occurred creating the form. See Exception.InnerException for details. The error is: ActiveX control '548c6316-751f-4b34-b8d9-a56fcee53bc8' cannot be instantiated because the current thread is not in a single-threaded apartment."

Does anybody know how to preview report by using AxCrystalActiveXReportViewer in SAP B1?

Thanks

TONY