How to set value to FormBuilder object in angular 2 Typescript

You can achievie that by invoking setValue method on your FormControl object:

  (<FormControl> this.AMform.controls['Name']).setValue("new value");

or:

this.Name.setValue("new value");

Use patchValue method of your FormGroup object.

 onAccntChange(event: Event) {
    this.AMform.patchValue({yourControl: studentModelValue})
    }

Using setValue you need to specify all the FormControls:

this.AMform.setValue({'Name':'val1', 'Address':'val2'})

Using patchValue you can specify just the one you need:

this.AMform.patchValue({'Name':'val1'})

Here you can read a little bit more.

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