How to create a new user name, password, authentication

Question

Hi

How to create a New user using sql server 2005 using c#

i need to create the New user by using the requirements


USERNAME ------------------ TEXTBOX
PASSWORD-------------------TEXTBOX
CONFIRM PASSWORD--------------TEXTBOX
AUTHENTICATIO--------------------COMBOBOX
OK------------------------BUTTON
CANCEL--------------------BUTTON

And if i click on ok it should connect to database and update the new username  and password.........

Please help me regarding this...................