Information sent from a form with the POST method is invisible to others and has no limits on the amount of information to send.
Input validation is a great place to begin learning about error handling and bug fixing.
The validator is a Input Box Validating Handler delegate which you can use to validate the Text.
The following sample checks whether the Text is not empty.
You could try to intercept the keys that get pressed and only allow one decimal point. Check it out and it will show you how to parse input to validate that you have a double and then use that double in some way (I used a msgbox to display it). Length ' total provided input string length Dim str_number(_Count) As String ' maybe the length is all whole numbers?
Dim str_Decimal As String ' Same as above Dim str_Percent(_Count) As String ' maybe the length is all decimal numbers?