public static void Alerts(this TempDataDictionary tempData, string message, AlertFlavor flavor = AlertFlavor.Info,
bool isDismissable = false)
{
if (tempData == null)
{
throw new ArgumentNullException("tempData");
}
var alerts = tempData.Alerts(true) ?? new List <AlertModel>();
alerts.Add(new AlertModel
{
Message = message,
Flavor = flavor,
IsDismissable = isDismissable,
});
tempData[AlertKey] = alerts;
}