UniqueConstraint Constructor (String, String[], Boolean)

Initializes a new instance of the UniqueConstraint class with the specified name, an array of DataColumn objects to constrain, and a value specifying whether the constraint is a primary key.

Namespace: System.Data
Assembly: System.Data (in system.data.dll)

public UniqueConstraint (
	string name,
	string[] columnNames,
	bool isPrimaryKey
public UniqueConstraint (
	String name, 
	String[] columnNames, 
	boolean isPrimaryKey
public function UniqueConstraint (
	name : String, 
	columnNames : String[], 
	isPrimaryKey : boolean



The name of the constraint.


An array of DataColumn objects to constrain.


true to indicate that the constraint is a primary key; otherwise, false.

This constructor is provided for design time support in the Visual Studio .NET environment. UniqueConstraint objects created by using this constructor must then be added to the collection via AddRange. Columns with the specified names must exist at the time the method is called, or if BeginInit has been called prior to calling this constructor, the columns with the specified names must exist at the time that EndInit is called.

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0