There is this Visualforce page. There are several fields in that page which I want to make mandatory. So I tried, starting by one field. So if the fields are empty, I don't want the user to pass on to the next page. I tried putting
required = "true"
in visualforce page block that helped me preventing from the user going to next page but it did not show any kind of error or so through which the user can come to know what is missing.
I tried the following code for validation rule but it didn't work. Am I doing something wrong here ?
ISBLANK( Mailing_Street__c )