Error message box

[RuthJen]

In a model driven app, is it possible to display error messages to the end-user in a message box if the validation fails?

[xrm · Accepted solution]

Yes it is definitely possible and can be done in many ways 

1. Business rule - If you need to validate something and show an error message on a specific field
1. Create a business rule on that entity
2. Add a condition
3. Show error message based on the above condition
2. Real-Time Workflow – 
1. Go to Solution--> Processes
2. Create a real-time workflow on that entity
3. Add a check condition
4. Stop Workflow with canceled --> Click on properties and enter your custom message in there
3. Web Resource - Custom logic using JavaScript
4. Plugin