dynamically remove an element's required attribute in ASP MVC?

You can use the .rules() method built into jQuery, you don't need to manually remove attributes.

To remove:

$("#txtTempHireEndDate").rules("remove", "required")

To add:

$("#txtTempHireEndDate").rules("add", "required")

you can use rules function in jquery.validate

$("..").rules("add",....)
$("..").rules("remove",...)

http://jqueryvalidation.org/rules