How do I highlight a textbox border red when it is required?

Question

What property do I use on the required field validator control to make the textbox red if there is a validation error?

Here is my code:

Answer 1

ASP.Net web forms internally uses a Javascript frameworka located at aspnet_client\{0}\{1} folder to handle the validation, etc. They are basically determined from the property ClientScriptsLocation

Try overriding the default framework function by keeping it in your page includes additional line to set the control_to_validate color

document.getElmentById(val.controltovalidate).style.border='1px solid red';

JS