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Posted by / 16-Jun-2017 18:43

Validating numeric textbox in vb net

You can also make use of Filtered Text Box Extender. On key Press event, just call a function and pass event as parameter. Can you tell me how I can compare the value of 2 textboxes in c#? Textbox1 = 3, Textbox2 = 4 I want to throw an error message to say something to the effect that the value entered in Textbox2 has to be smaller than textbox1. This code is used to set a restriction on a textbox and allow only number to be entered in Visual Basic .NET The code will be added to the Text Box Key Press event.I'm fairly new to (self taught) and was just wondering if someone out there could help me out with some code. I also have a button that is enabled or disabled depending on the status of the textbox - in my winforms code i did the following successfully: Private Sub cvalue_Key Press(By Val sender As Object, By Val e As System. Focus() 'allow tab and focus on next field If cvalue. You can use Regular Expression to validate a Textbox to enter number only.

They make use of a pattern matching system to match the input with a certain pattern of data.

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.

Is Null Or Empty(str Phone Num) Then Phone Valid = re Phone. Text) Then 'Call Phone Validation Function Message Box. I set up my Expression to allow only numbers, but in the format I explained earlier.

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.

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I would still love to hear from others if it would be possible to validate on a keypress by keypress event to allow numbers and decimals only.

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