In the last lecture we learned how to create and use a reactive form in Angular. In this lecture, let's understand how to do form validation for a rective form and understand the form state. Unlike template driven form, the validation of a reactive form is done in typescript class and not in HTML.

For the reactive form validation, we can use Validators static class, which provides some validator properties which we can use for the form validation.

So, in this lecture you will learn:
1. How to add validators on form controls in reactive form?
2. How to show red border around invalid form control?
3. How to show default value for a control?

Let's learn above topics with some simple examples. This is a continuation of previous lecture. So, please watch previous lecture before proceeding.

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