如何确保系统只将正确的日期格式输入到sql server中

I have a textbox which allows a user to enter a date for their date of birth. The application formats the date to "MM/dd/yyyy". The catch is if someones date of birth is 1/1/2000, l get an error as the date is not valid. How can l correct this so that if the user enters 1/1/2000 into the textbox, the application converts it to 01/01/2000 before insertion into sql server database.I have a textbox which allows a user to enter a