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Sending data is not enough — we also need to make sure that the data users fill out in forms is in the correct format we need to process it successfully, and that it won't break our applications.
The following validation rules are currently included: A: You can validate against a whole range of things using the regular expressions validation rules, so we cannot give examples for every use case.This increases performance and reduces traffic over the Web.A slightly negative aspect of validating data on the user's computer is that the validation is performed via a script residing in the Web page. You only have two possible scripting languages that you can use on a user's computer: VBScript or Java Script.Here setting validate All Properties = true is the important part.If it is false then it will perform only the first default validation 'Required' and it will not check other Validation for the properties like 'Regularexpression', 'Range', etc.
One of the features of HTML5 is the ability to validate most user data without relying on scripts.