ADO.NET in a Nutshell

This collection stores the constraints for a table, which it exposes through the DataTable.Constraints property. It can contain any class that derives from Constraint , including ForeignKeyConstraint and UniqueConstraint objects. You can retrieve an individual constraint by index or name .

public class ConstraintCollection : InternalDataCollectionBase { // Public Instance Properties public virtual Constraint this[string name ] {get; } public virtual Constraint this[int index ] {get; } // Protected Instance Properties protected override ArrayList List {get; } // overrides InternalDataCollectionBase // Public Instance Methods public virtual Constraint Add (string name , DataColumn[ ] columns , bool primaryKey ); public virtual Constraint Add (string name , DataColumn[ ] primaryKeyColumns , DataColumn[ ] foreignKeyColumns ); public virtual Constraint Add (string name , DataColumn column , bool primaryKey ); public virtual Constraint Add (string name , DataColumn primaryKeyColumn , DataColumn foreignKeyColumn ); public void Add ( Constraint constraint ); public void AddRange ( Constraint[ ] constraints ); public bool CanRemove ( Constraint constraint ); public void Clear ( ); public bool Contains ( string name ); public int IndexOf ( Constraint constraint ); public virtual int IndexOf ( string constraintName ); public void Remove ( Constraint constraint ); public void Remove ( string name ); public void RemoveAt ( int index ); // Protected Instance Methods protected virtual void OnCollectionChanged (System.ComponentModel.CollectionChangeEventArgs ccevent ); // Events public event CollectionChangeEventHandler CollectionChanged ; }

Hierarchy

System.Object InternalDataCollectionBase(System.Collections.ICollection, System.Collections.IEnumerable) ConstraintCollection

Returned By

DataTable.Constraints