New answers tagged error-handling
Instead of using SharePoint Event Receiver, write a Custom Web Service.. Call that service from InfoPath form, you will have the option to communicate between InfoPath form and Service (SharePoint in short)..
It's not possible to send message from event receiver to InfoPath. But you can send email to user.
This is a known limitation of the datasheet because it uses the lists.asmx web service on the backend. There really is no way to do what you want to do cleanly. Here re your options as far as I can see: Create a custom UI using something like Kendo UI's gridview and ListData.svc so that you can add your own validation in between SharePoint and the user. ...
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