An error occurred while loading the Crystal Report column header.

Q: Developed Using Crystal ReportsProgramAfter running for a period of time, loading the crystal report failed.

A:

1. This problem may be caused by the fact that the crystal report files under the Windows Temporary Folder are not cleared in time. Open the Temporary Folder and the files will run normally after deletion.

2. (1). the reportdocumen instance must be a class member private reportdocument prtp = new reportdocument ();
 
(2) After using the crystal report, you must close the file so that it will not be generated in the temporary file of windows.

Private void page_unload (Object sender, eventargs E)
{
Prtp. Dispose ();
}

The same applies to winform.