SQLServer.Database.Table Object
Commits a unit of Table property changes previously marked with BeginAlter using ALTER TABLE ... WITH NOCHECK. All property changes made since calling BeginAlter will be committed to SQL Server using a single update.
Table.DoAlterWithNoCheck
HRESULT pTable->DoAlterWithNoCheck ( );
To add a check constraint or foreign key constraint to a table using the WITH NOCHECK option, first call the BeginAlter method, then make the property changes, then call DoAlterWithNoCheck.
ALTER TABLE ... WITH NOCHECK