asp CustomValidator: validate event function (C#)

<%@ Page Language="C#" %>

<script runat="server">

    void valProductCode_ServerValidate(Object source, ServerValidateEventArgs args)
    {
        if (args.Value.Length == 4)
            args.IsValid = true;
        else
            args.IsValid = false;
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Show Validate Empty Text</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    <asp:Label  
        id="lblProductCode"
        Text="Product Code:"
        AssociatedControlID="txtProductCode"
        Runat="server" />
    <br />
    <asp:TextBox
        id="txtProductCode"
        Runat="server" />
    <asp:CustomValidator
        id="valProductCode"
        ControlToValidate="txtProductCode"
        Text="(Invalid product code)"
        ValidateEmptyText="true"
        OnServerValidate="valProductCode_ServerValidate" 
        Runat="server" />
    
    <br /><br />
    
    <asp:Button
        id="btnSubmit"
        Text="Submit"
        Runat="server" />    
    
    </div>
    </form>
</body>
</html>

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asp CustomValidator: validate event function (C#) : CustomValidator « Validation by Control « ASP.Net

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