How to display windows form application report at runtime

1. Ensure the Crystal Reports Runtime is Installed:
   - Make sure that you have installed the appropriate version of the SAP Crystal Reports runtime on the machine where your application is running. The Crystal Reports runtime is required to view Crystal Reports at runtime.

2. Check the Report Path:
   - Confirm that the path to the Crystal Report file is set correctly in your code. Make sure the report file is accessible and exists in the specified location.

3. Report Viewer Control:
   - If you are using a report viewer control, make sure it is added to your form or web page correctly, and you've set the report source.

4. Set the Report Source:
   - If you're using the Crystal Reports viewer, make sure you set the report source property to your report document. 

crystalReportViewer.ReportSource = yourCrystalReportDocument;

5. Ensure Database Connectivity:
   - If your report is database-driven, ensure that your application can connect to the database and that the database connection details in your report match the ones in your application.

6. Handle Exceptions:
   - Surround your Crystal Reports code with try-catch blocks to catch and log any exceptions that might be occurring. This will help you identify and troubleshoot any runtime errors.

7.Verify Data Sources:
   - Verify that the data sources used in your report are available and have data. If the data source is missing or has issues, it can lead to an empty report.

8. Correct Database Drivers:
   - Ensure that the appropriate database drivers are installed on the machine where your application is running. If Crystal Reports is using a specific database, the corresponding database drivers must be installed.

9. Debugging and Logging:
   - Implement logging or debugging in your application to track the execution flow and see if any issues occur when loading the report.

10. Update SAP Crystal Reports Runtime:
    - Make sure you are using the latest version of the SAP Crystal Reports runtime. Sometimes, updating to the latest version can resolve compatibility issues.

11. Check Permissions:
    - Ensure that the user running your application has the necessary permissions to access the report file and data sources.

12. est Locally and on Different Machines:
    - Test your application on your development machine and on different machines to ensure that the issue is not specific to one environment.