ASP.NET custom function is not called

Question

I have the following code:

<asp:TableCell>
    <asp:Label Text="Date of Birth:" Runat="server" cssClass="EditLabel" ID="Label3"/>                                              
</asp:TableCell>
<asp:TableCell>
    <asp:Textbox id="txtDOB" Runat="server" EnableViewState="True"/>
    <asp:CustomValidator ControlToValidate="txtDOB" ErrorMessage="Date of Birth is not Valid" Runat="server" OnServerValidate="CheckDOB">*</asp:CustomValidator>                        
</asp:TableCell>
<asp:TableCell>

Function is defined as:

Protected Sub CheckDOB(ByVal source As Object, ByVal args As ServerValidateEventArgs)

  ....

End Sub

When I submit the code function is never hit. What is missing here?

Can you show the markup for the button (assuming that is how the form is being submitted)? — Matt M
– Matt M, Commented Jul 23, 2013 at 15:38
<asp:TableRow> <asp:TableCell> <asp:Button Text="Add Participant" Runat="server" ID="btnAddParticipant"/> </asp:TableCell> </asp:TableRow> — S Nash
– S Nash, Commented Jul 23, 2013 at 15:43
I have 2 Required field validators that work properly when button is pressed. — S Nash
– S Nash, Commented Jul 23, 2013 at 15:43
I can enter any text in txtDOB without any errors. the Main problem is when I put a breakpoint at Protected Sub CheckDOB, it will never hit. — S Nash
– S Nash, Commented Jul 23, 2013 at 15:45

Comfortably Numb · Accepted Answer · 2013-07-23 16:02:34Z

1

Try redefining the handler. Remove OnServerValidate="CheckDOB" from Custom ASPX validator markup and define handler in VB like this:

Protected Sub CheckDOB(ByVal source As Object, ByVal args As ServerValidateEventArgs) Handles CustomValidator1.ServerValidate

End Sub

answered Jul 23, 2013 at 16:02

Comfortably Numb

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7 Comments

S Nash Over a year ago

OK, Adding the handler directly make it work. I have no idea why for this case it needed a handler explicitly. Now IF I have valid data for First Name and Last Name and press the button then CheckDOB is called. You get a +1 here. But I need to know why some controls like button do not need an explicit event handler.

Comfortably Numb Over a year ago

Your code worked without explicit handler in my environment. but then I simple copy/pasted your code from here. I guess your page's markup is a lot more complex, so, something must be interfering. As a rule of the thumb in VB.NET code I always use Handles approach.

Comfortably Numb Over a year ago

By the way, if you want to handle 'no data' scenario - add ValidateEmptyText="true" to your Custom Validator attributes

S Nash Over a year ago

You said my code worked when you tried it. no my code is not complex. Just try this also : Add a textbox name it Fname and add a requiredfiled validator for it. Now see if Customvalidator is still working. I appreciate your time for testing this.

S Nash Over a year ago

I don't see a ValidateEmptyText attribute. I Guess it is not part of framework1.1 which I am limited to, but that's OK.

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