The contextual information provided includes the type of action that caused the trigger to fire, which columns were modified in an UPDATE operation, and, in the case of a data definition language (DDL) trigger, an XML EventData structure (see "Transact-SQL Reference" in SQL Server Books Online) that describes the triggering operation.

An instance of Microsoft.SqlServer.Server.SqlTriggerContext is available from the Microsoft.SqlServer.Server.SqlContext class, when the code is running inside a trigger through the SqlContext.TriggerContext property.

Namespace: Microsoft.SqlServer.Server
Assembly: System.Data (in System.Data.dll)
Assembly Versions: 2.0.0.0
Since: .NET 2.0