php - how to redirect url after submitting a form?

It seems to be a simple but still it is difficult for me to achieve.
Let`s make a small example to clarify the situation:
There are two files: Form.PHP and Action.PHP

Form.PHP has one Input field with name = "ID"
and button SUBMIT

Action.PHP has a script of inserting data in MySQL
and in the end next line:

header("location:Form.PHP");

So after the submitting the form, I come back to Form.PHP...
This is easy...

Now, I want to achieve - after the submitting the form redirection to
Form.PHP?ID=$_POST['ID']

So please help me to modify
header("location:Form.PHP"); to redirect to ?ID=$_POST['ID']

Answer

header("Location: Form.PHP?ID=".$_POST['ID']);