Asp.net, vb.net, C#.net Resources

How to validate a CheckBox?

<asp:CheckBox runat="server" id="chkbox"></asp:CheckBox>

<asp:CustomValidator runat="server" ErrorMessage="Error!" OnServerValidate="ServerValidation" ClientValidationFunction="ClientValidation"

ID="Customvalidator1" />

<asp:Button runat="server" text="submit" ID="Button1" />

<script language="javascript">

function ClientValidation(source, args)

{

args.IsValid = document.all["chkbox"].checked;

}

</script>

VB.NET

<script runat="server" language="vb">

sub ServerValidation( source as object, args as ServerValidateEventArgs )

args.IsValid = chkbox.Checked

end sub

</script>

C#

<script runat="server" language="cs">

void ServerValidation(object source, ServerValidateEventArgs args)

{

args.IsValid = chkbox.Checked;

}

</script>

I tried to implement this code and get an error.

Exception Details: System.Web.HttpException: Control 'chkTerms' referenced by the ControlToValidate property of 'CVTerms' cannot be validated.

 aspx:

<asp:CheckBox ID="chkTerms" runat="server" Text="I have read and agree with your <a href=&quot;#&quot; onClick=&quot;popup('terms.asp','500','400');&quot;>Terms &amp; Conditions</a>." />

<asp:CustomValidator ID="CVTerms" runat=server ControlToValidate="chkTerms" ErrorMessage="You must accept our Terms and Conditions." ValidationGroup="CreateUserWizard1" OnServerValidate="ValidateChkTerms" ClientValidationFunction="ValidateChkTerms"  />

 

.vb

Protected Sub ValidateChkTerms(ByVal sender As Object, ByVal e As ServerValidateEventArgs)
        Dim terms As CheckBox = CreateUserWizard1.CreateUserStep.ContentTemplateContainer.FindControl("chkTerms")
        e.IsValid = terms.Checked
End Sub

     Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim terms As CheckBox = CreateUserWizard1.CreateUserStep.ContentTemplateContainer.FindControl("chkTerms")

        ClientScript.RegisterClientScriptBlock(Me.GetType(), "ValidateChkTerms", _
         "function ValidateChkTerms(oSrc, args){args.IsValid = document.getElementById('" & terms.ClientID & "').checked;}", True)
    End Sub

Any idea whats wrong?  The Client=side validation works fine.
 

In your <asp:CustomValidator> tag you must remove the ControlToValidate attribute