文本框的C＃Asp.net验证方法？

Question

I'm new to using c# in asp.net

I was just wondering what the best methods of validation are for when it comes to checking a textbox that has to be number's (and 1 decimal point) only, I've read about ajax but I understand that this only works if the client supports it, so I'm now looking into new methods.

Also do these validation methods have the ability to prevent a event such as a button press from triggering and causing the web application to break?

Answer 1

Always validate data at client side as well as server side (in code behind) . For example you can use the asp.net provided validation control which will provide you with Client side validation, In server side validation (in C#) you can implement your own logic for data validation. For example in your case you can use double.TryParse to see if the string entered in the TextBox is a valid double number.

The reason to have Both types of validation is:

• Client may have disabled javascript on the browser.
• Client's browser doesn't support Javascript ( see this question )