Combines and displays validation error messages from all fields on the form
The summary is a control that you can place anywhere and multiple times on your form. It will by default be hidden until a validation or required field flags a error message.
Some common use cases are:
IF you have a very long form or multiple tabs and you need to let you users know that there is a validation error message. The validation summary control will indicate which fields this message is for.
The validation summary control allows you to place the validation message anywhere on the form.