Cancel = True End Sub Private Sub Txt Employeenumber_Key Press(sender As Object, e As Key Press Event Args) Handles Txt Employeenumber. NET textbox, which event handler is better to use: Validating or Leave? Set Error(txt, "") Else something(txt.text) End If End Sub Notice how I assign each one of the Textbox's Key Press Event Handler to the single Numeric Validation_Key Press sub routine.
I am doing a simple aplication using Windows Forms and I have a question...
My form has 15 textboxs and I want to validate everyone using the event Key Press or validating.
You hook up each textbox to the same event handler (the example I provided uses buttons..
Key Press Dim tb As Text Box = CType(sender, Text Box) If Not Is Numeric(tb.
Agreed that Regular Expressions might be faster, but ... Basically, this code is for a User Control which contains a label, a text box, and an error provider.
It also has various other properties, but here's the bit which deals with validation.
Text Box1, "This field does not accept negative values.") Me.
Dim txt As Text Box = Direct Cast(sender, Text Box) ' See if it’s blank.
Handled = True End If End Sub NOTE: This code sample is assuming Win Forms, different approach must be used for web...
Using that logic is like saying don't bother writing Java Script validation for the web because the user might have Java Script turned off...
Imagine the following: I am trying to copy an number from a website.