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Also day should be less than 31, Month should be less than 12 and Year not greater than 2012 . We can prevent user from typing invalid data or we can also check the data after user submitting.Here I'll introduce you the second approach because the first requires more code to do, it may prevent user from typing invalid data but it also has to prevent user from pasting invalid data. For the second approach you can add code to a You make your life easier if you use the datatimepicker but if you still feel you want to present a textbox and help the user to prevent entering an illegal date this sample code will get you going.
For your first suggestion of a text box that only allows numbers, you might also want to consider a Numeric Up Down.It is usually better to show their keypresses but display a warning that the input is currently invalid.It's probably also quite complicated to set up for masking an email-address regular expression for example.Validation starts with Validator1, Validator2 and finally Validator3.You can assign one of these properties or all of them if you need to perform multi-level validation.