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UpendraUpendra 

What happens when we write ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR, '') and sObject.addError()

What salesforce internally does in case of:

1. ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR, 'Error message')
2. sObject.addError(String errorMsg)
Amit Chaudhary 8Amit Chaudhary 8
ApexPages.addMessage

Add a message to the current page context.
1)https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/apex_System_ApexPages_addMessage.htm
2) http://www.infallibletechie.com/2012/10/how-to-display-error-messages-in.html
3) http://www.sfdcpoint.com/salesforce/show-error-message-visualforce-page/

sObject.addError
Marks a record with a custom error message and prevents any DML operation from occurring
1) https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_methods_system_sobject.htm

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