A name doesn't generally contain weird symbols, and definitely not numbers. This can be from the mouse clicking inside another field, or a Tab key being pressed to navigate to the next input control. ") Else Email Valid = True 'Email is Perfect End If Else 'Not A Match To Pattern Email Valid = False 'Set Boolean Variable To False Message Box. I hope you have learned from this article and that you have enjoyed it as much as I did.
That may seem like Captain Obvious speaking, but you'll be amazed at some of the data that gets entered into a name field. I then created an If statement to determine how the input data was formatted and whether or not the data is only alphabetic.
The events for this textbox were added by Visual Studio. According to the provided information, I am not sure how exactly you set up your application.
I added "Hello World" message to the Validating event, but it never was fired. That is why I have prepared a sample project following the demonstrated approach in the following help article: Indeed, the Validating event is not fired for the hosted textbox.
This means that as a programmer, you have the power to supply the exact pattern for the input you desire in any text input field. Again, certain special characters are obviously not allowed.
They make use of a pattern matching system to match the input with a certain pattern of data.
Is Match(str Phone Num) 'Check Validity Else Phone Valid = False 'Not Valid / Empty End If Return Phone Valid 'Return True / False End Function Private Sub txt Tel_Lost Focus(sender As Object, e As System. If it isn't valid input, it will clear the textbox and give it the focus again; if it is valid, the Phone Valid variable gets updated to true.
So, what I am trying to say is: make sure you understand other cultures, or be aware of people with uncommon names. Using Regular expressions here, is basically the standard, even though it is a bit messy. Focus() 'Return Focus End If End Sub Here, I created a separate function to do all the work.
Add this to validate the surname textbox: Private Sub txt Surname_Leave(sender As Object, e As System. Leave 'Create A Pattern For Surname Dim str Surname As String = "^[a-z A-Z\s] $" Dim re Surname As New Regex(str Surname) 'Attach Pattern To Surname Textbox 'Not A Match If Not re Surname. Add the following code to validate your phone number textbox: 'Function To Check Phone Number Validity Public Function Validate Phone(By Val str Phone Num As String) As Boolean ''Create Reg Exp Pattern Dim str Phone Pattern As String = "^[1-9]\d-[1-9]\d-\d$" 'Create Reg Ex Object Dim re Phone As New Regex(str Phone Pattern) 'Something Typed In If Not String. This function is later called inside the textbox's Lost Focus event, which also fires when a control loses the focus. Keep in mind that each country has its own domain name, which sometimes will look like: Private Sub Validate Email() 'Set Up Reg Exp Pattern To Allow Most Characters, And No Special Characters Dim re Email As Regex = New Regex("([a-z A-Z0-9_\-\.] )@((\[[0-9]\.[0-9]\.[0-9]\." _ ")|(([a-z A-Z0-9\-] \.) ))([a-z A-Z]|[0-9])", _ Regex Options.
NIB: How to: Select Validation Schemas for HTML Editing in Visual Web Developer NIB: How to: Set Validation Defaults for HTML Editing in Visual Web Developer Walkthrough: Advanced HTML Editing in Visual Studio for Web Forms Pages A schema determines which elements, attributes, and capitalization is valid in that schema.
(It also determines the tags and attributes that will be available in Intelli Sense.) Select this option if you want Visual Studio to use the content of the page's Some schemas do not offer options to mark individual types of errors.