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Editorial Team
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Asked: 2026-05-13T23:28:14+00:00

I’m building form validation controls for our C# ASP application. The bulk of the

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I’m building form validation controls for our C# ASP application. The bulk of the work is handled by a BaseValidator control (subclassing System.Web.UI.UserControl), which also has the markup for the validation output. This is then extended by subcontrols like PasswordValidator, that provides the Validate method and any extra fields needed by that validator control.

(The end goal is to have controls like <uc1:PasswordValidator ControlId=”txtPassword” /> which we can plop into any form with minimum duplication.)

However, PasswordValidator.ascx.cs cannot access the form elements defined in BaseValidator.ascx; the only way I’ve found to do so is to duplicate the markup in each subcontrol’s *.ascx file. How can I extend BaseValidator.ascx.cs and access BaseValidator.ascx’s markup in the subclass?

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  1. Editorial Team

    Thanks for the suggestions.

    I solved this using a service and the strategy pattern. There is a central FieldValidator class which provides validation for any user interface. For the web interface, these methods are exposed through a WebService and (through the WebService) a UserControl. There are no issues with accessing the page elements, because there is now only one UserControl class that stands between the form and the WebService.

    For example, <uc1:FieldValidator ControlType="Password" ControlToValidate="txtPassword" runat="server" > will plop down fully-functional clientside and serverside validation, with no need for code behind. Great! 🙂

    (I mentioned resolution a while back in a reply to my question, but I can’t mark that as answered.)

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