Error In Displaying Message When There Is An Attachment

I am trying to display an error message in SharePoint 2013. I added the following code
inside my ItemAdding() event receiver to force it to have error:
properties.Status = SPEventReceiverStatus.CancelWithError;
properties.ErrorMessage = "test";
It
works okay, I can see the error message.
However, when I attach any files, and try again, after saving, the attachment will disappear.
When I attach again, I will get a server error:
Please advise.

Hi,
According to your post, my understanding is that you wanted to display error message when there is an attachment.
You need to add “properties.Cancel = true;” to your ItemAdding() event receiver.
You can cancel the event using:
properties.Status = SPEventReceiverStatus.CancelWithError;
properties.Cancel = true;
properties.ErrorMessage = "test";
The properties.Cancel determines if the event should be cancelled. The default is false but once you set it to true it will cancel the event when the current execution ends.
Here is a similar thread for your reference:
http://stackoverflow.com/questions/17828963/custom-error-message-for-event-receiver-in-sharepoint-2010
More information:
http://davehunter.co.uk/2009/03/12/sharepoint-event-receivers-by-example-email-validation/
Best Regards,
Linda Li
Linda Li
TechNet Community Support

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