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How to allow a user to enter html comments
<b>text</b>

[ValidateInput(false)]
public ActionResult foo()
{
}

public class Foo
    {
        [AllowHtml]
        public string bar{ get; set; }
    }

</system.web>
  <httpRuntime requestValidationMode="2.0" />
</system.web>

public class MyModel
{
    public MyModel()
    {

    }

    // Some other stuff in here

    [AllowHtml]
    [HttpPost]
    public string MyHtmlString { get; set; }

}