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this is part 7 of angular 6 tutorial in this video well discus how to update HTML elements on a form with new data first lets understand why do we need to update HTML elements on a form with new data lets say were using this form to edit an existing employee details for us to be able to edit an existing employee details we must first retrieve that existing employee details from a server and then populate these controls on the form with that retrieved data this can be very easily achieved using set value method now if we take a look at this abstract control class provided by angular it has this method set value now we know both form group and form control classes inherit from this base class abstractinterface this means on both the form Group instance and from control instance we can use set value method so here is what we want to do when we click this load data button we want to retrieve the existing data and then populate these form controls that that existing data so first lets