The BeginAlter method marks the start of a unit of change for the object referenced.
object.BeginAlter()
object
Expression that evaluates to an object in the Applies To list
HRESULT BeginAlter();
Outside of a BeginAlter/DoAlter block, each change to a SQL-DMO object property causes a discrete update to the referenced Microsoft® SQL Server™ 2000 component. Group multiple changes by calling the BeginAlter method.
All changes made after the BeginAlter method are submitted to SQL Server the next time the DoAlter method is called on the object.