Maskedtextbox validating

27 Jan

The start and ending qualifiers of the regular expression, ^ and $, are implicit - you do not need to include them.This code demonstrates a Validation Text Box that only accepts a 5 digit zip code.In my windows form projects , i have validated the fields using Boolean method.Find the below sample screen shot for validating the fields before saving the data Img 3: Validation method Here I have validated the fields using the Boolean method, If all the field values are entered properly it will return true, other wise it will return false and will display an error message.If you do this, as well as subscribe to the Type Validation Completed event, on the form Load event, you can handle user validation inside your Type Validation Completed event handler.If you want to read about the Masked Text Box, it's all on MSDN.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.

Figure 1 - These objects will determine if all our data is valid or not. Clear() 'Clear Text Box Name Valid = False 'Boolean = False Else Name Valid = True 'Everything Fine End If End Sub Easy one to start with. Focus() 'Set Focus To Text Box End If End Sub Private Sub txt Email_Lost Focus(sender As Object, e As System. Lost Focus Validate Email() 'Check Email Validity End Sub The expression may look horrible to the layman's eye, but look closer. To check if the user has entered an email that actually exists, you will have to find a different way such as to send a of some sorts.you have a property named 'Show Place Holders', make it false. sry, just reminding you you have a property named 'Show Place Holders', make it false. sry, just reminding you OP: That post is the correct way to do this. It is nothing but a nuisance for anything but input. Well, sometimes a good structured and thought out If statement can suffice, but it can become quite long and cumbersome in the future. By using Regular Expressions this way, you can reduce the chances of getting errors at erratic times. This sub checks the email's format and if it thinks that it matches, it returns True and vice versa.The Error Provider is a Win Forms control that allows you to show a red exclamation mark with an error message tooltip next to a control.It's really useful when combined with the above data validation method.