Sometimes people are just trying to be funny, or they are literally trying to break your program. If the data is indeed only alphabetic letters (no symbols, no numbers or any other punctuation characters) the test succeeds and stores True inside the Name Valid variable. This is because it becomes more legible than just a normal set of numbers. You could say that a program's testers are supposed to do this; yes, they should - nobody else should. If not, if there is even just one unallowed character that is not supposed to be there, the Match method will return False. Instead of you having to loop through each character to determine what that character is, you simply need the correct Regular Expression pattern. Clear() Surname Valid = False Else Surname Valid = True End If End Sub It is basically the exact same code for the Name box, but I just included the capability to comprehend a space character as well. People expect to enter a phone number in a format similar to this: ###-###-####. @Vincent Kok After asking around it seems it depends on the country, latines europeans country (France, Spain, ...) will put it on the right and the north/east europeans country on the left, you can try it with amazone by example: ...Put the '$' in front of the text input field, instead of inside it.Copyright © 2008 The Extensible Markup Language (XML) is a subset of SGML that is completely described in this document.Its goal is to enable generic SGML to be served, received, and processed on the Web in the way that is now possible with HTML.So I have an idea, because i find it hard to make a code for txtbox that will only allow integer and not a letters in mysql using c#.My Plan is why not set the database column into integer instead of typical varchar and if ever you put a letter of course it will turn and exception so in that case I want to catch the exception and prompt a messagebox saying "Please enter only integer". You don't need to duplicate tags in title (especially in form of question "I'm using C#? Side note: your actual question seems to be "how to validate if string is integer to store in DB"... You can ensure easily that user is entering a Numeric Field .
Based on each of these variables' values, we will know if the data is correct or not. The Leave event fires when the control loses focus. As you can see, Regular Expressions are a vital tool to have at your disposal, so become good friends with them.Visual studio have build in support for this ( and you may also achieve it via coding ) .Here's what you need to do :- Switch to design view from markup view . From the toolbox that opens click on Validation and drag a compare validator near your textbox.On this page we will show a few examples of how to validate e-mails, website addresses (URLs) and some other special cases of input data.» Validate e-mail address There is no way to be 100% sure an e-mail address is actually working unless you send an e-mail there.In other words, whenever a person first clicks an element, and then clicks anywhere outside of it. Onblur is used when you want to check each element (ie: text, textarea boxes ) individually, and ask the user to correct the input before moving on to the next box. The other event, onsubmit, validates the form at the end, as the user presses the submit button. The English version of this specification is the only normative version. In particular, erratum [E09] relaxes the restrictions on element and attribute names, thereby providing in XML 1.0 the major end user benefit currently achievable only by using XML 1.1.However, for translations of this document, see Technology? As a consequence, many possible documents which were not well-formed according to previous editions of this specification are now well-formed, and previously invalid documents using the newly-allowed name characters in, for example, ID attributes, are now valid.It makes validation for numeric data a lot easier because you don't have to parse out the '$' after submit.You can, with JQuery.validate() (or other), add some client-side validation rules that handle currency.