Table<TEntity>.ITable.DeleteOnSubmit Method (Object)
Puts an entity from this table into a pending delete state.
Assembly: System.Data.Linq (in System.Data.Linq.dll)
LINQ to SQL does not support or recognize cascade-delete operations. If you want to delete a row in a table that has constraints against it, you must either set the ON DELETE CASCADE rule in the foreign-key constraint in the database, or use your own code to first delete the child objects that prevent the parent object from being deleted. Otherwise, an exception is thrown.
Available since 3.5
Windows Phone Silverlight
Available since 7.1