Add new employee again

Question

i have created C# windows form, in here my expectation is to add new employee to the system and after successfully added need to show form again by clear every field and show next employee to add. in my form their is a auto generating employee number so it also should want to increment by one. but now i can add employee to the system and after close the form and again open it then it will show me next employee number without any matter. but that's not what i need 

in advance please
thank you