C maskedtextbox validating
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.Actually we want to simulate the Key-Press of the Insert Key.But we don't have the Windows Forms' Send Keys method anymore.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_\-\.] )@((\
1) Field level Validation should control what characters are valid as input to the field, and what would be the overal structure of the input (examples: xx-xx-xxxx, xx.xx).NET class and finding out how to control the Keyboard and especially the Insert Key in WPF.So we will start with the following small example: We have a simple Text Box Control that we want to mask and a simple Button Control that serves as an alternative place for the focus, in order to test the behavior of the Text Box when it looses it. Masked Text Provider class basically works as follows: We provide a mask (the same mask we used to apply in the Win Forms Masked Text Box) at the constructor of the object.This can be maintained either through Masked Text Box, or it can be manualy implemented by responding to regular Text Box field events.For instance, events Key Press, Key Up or Key Down can be used to validate current input key value against list of valid values (including control keys), or if you are making custom masked field, you can use this for string assembly of final text that would be presented.