SPAlert class

Represents an alert, which generates periodic e-mail or Short Message Service (SMS) notifications sent to a user about the list, list item, document, or document library to which the alert applies.


Namespace:  Microsoft.SharePoint
Assembly:  Microsoft.SharePoint (in Microsoft.SharePoint.dll)

public sealed class SPAlert

SPAlert provides information about the alert, such as which alert template is used, the alert frequency, and the UserID of the user who created the alert.

Use the Alerts property of either the SPUser or SPWeb class to return an SPAlertCollection object that represents the collection of alerts for the user or Web site. Use an indexer to return a single alert from the collection.


Use the Update method after making any changes to the alert.

This code example uses the SPAlert class to iterate through all the alerts for every user of a site and update the alert frequency.

SPWeb oWebsite = SPContext.Current.Web;
SPUserCollection collUsers = oWebsite.Users;

    foreach (SPUser oUser in collUsers)
        SPAlertCollection collAlerts = oUser.Alerts;

         foreach (SPAlert oAlert in collAlerts)
             oAlert.AlertFrequency =  


Certain objects implement the IDisposable interface, and you must avoid retaining these objects in memory after they are no longer needed. For information about good coding practices, see Disposing Objects.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.