Exclude sensitive form data from elmah logs

gistfile1.cs

//in global.asax
void ErrorLog_Filtering(object sender, ExceptionFilterEventArgs e)
{
    var ctx = e.Context as HttpContext;
    if(ctx == null)
    {
      return;
    }
    ElmahSensitiveDataFilter.Apply(e, ctx);
}

gistfile2.cs

public static class ElmahSensitiveDataFilter
{
  public static void Apply(ExceptionFilterEventArgs e, HttpContext ctx)
  {
    var sensitiveFormData = ctx.Request.Form.AllKeys
            .Where(key => key.Equals("password", StringComparison.OrdinalIgnoreCase)).ToList();
    if (sensitiveFormData.Count == 0)
    {
      return;
    }
    var error = new Error(e.Exception, ctx);
    sensitiveFormData.ForEach(k => error.Form.Set(k, "*****"));
    Elmah.ErrorLog.GetDefault(null).Log(error);
    e.Dismiss();
  }
}