VB.Net WinForm Validation ErrorProvider regular expression

I would like to validate a text box on a windows form in VB.Net to check first that the required field has a value and then check to make sure it matches the RegEx.  This is a Windows Form and not ASP.  I have been trying ErrorProvider and I can get it to check for a required feild, but not then check the same textbox for the regex.  

Thank you.
Private Sub TruckNoTextBox_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles TruckNoTextBox.Validating
        Dim Regex As New Regex("^[Y,S,0-9]{1,4}$")
        If Regex.IsMatch(TruckNoTextBox.Text) Then
            ErrorProvider2.SetError(TruckNoTextBox, "Please enter correct format")
        Else
            ErrorProvider2.SetError(TruckNoTextBox, "Wrong")

        End If

Open in new window

LVL 5
rtayIT DirectorAsked:
Who is Participating?
 
rawinnlnx9Commented:
In the controls properties you have set

CausesValidation=true

That's going to fire your validation. Somewhere in your code you need to call Form or panel or whatever .Validate().

Is your validation routine executing and the RegEx is just failing?
0
 
rtayIT DirectorAuthor Commented:
Your validate() soultion did the trick.  Now for the second part, how can I check to make sure the field is not empty first and then if it is not empy check the regex.  Here is the code working for regex.

Private Sub TruckNoTextBox_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles TruckNoTextBox.Validating
        Dim Regex As New Regex("^[Y,S,0-9]{1,4}$")
        If Regex.IsMatch(TruckNoTextBox.Text) Then
            ErrorProvider2.SetError(TruckNoTextBox, "")
        Else
            ErrorProvider2.SetError(TruckNoTextBox, "Wrong")

        End If
        Me.Validate()

    End Sub

0
 
rtayIT DirectorAuthor Commented:
got it with an elseif

0
 
rawinnlnx9Commented:
If TruckNoTextBox.Text = "" Then
End If

I'm comparing it to an empty "" but some prefer instead to use String.Empty
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.