ADO.NET in a Nutshell

Name

Rule

Synopsis

This enumeration is used to specify two properties of the ForeignKeyConstraint class: ForeignKeyConstraint.UpdateRule and ForeignKeyConstraint.DeleteRule. The value from this enumeration indicates what will happen to the related child rows when a change is made to a parent row. For example, by using a ForeignKeyConstraint.DeleteRule or Cascade, all child rows are removed when the parent row is deleted. If you use SetNull, the foreign key field in the child record is set to a null value. SetDefault restores the default value for the foreign key field; None performs no action.

public enum Rule {

   None = 0,

   Cascade = 1,

   SetNull = 2,

   SetDefault = 3

}

Hierarchy

System.Object → System.ValueType → System.Enum(System.IComparable, System.IFormattable, System.IConvertible) → Rule

Returned By

ForeignKeyConstraint.{DeleteRule, UpdateRule}

Passed To

ForeignKeyConstraint.{DeleteRule, ForeignKeyConstraint( ), UpdateRule}