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ConstraintCollection.Add Method (String, DataColumn[], Boolean)

Constructs a new UniqueConstraint with the specified name, array of DataColumn objects, and value that indicates whether the column is a primary key, and adds it to the collection.

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

public Constraint Add(
	string name,
	DataColumn[] columns,
	bool primaryKey
)

Parameters

name
Type: System.String

The name of the UniqueConstraint.

columns
Type: System.Data.DataColumn[]

An array of DataColumn objects to which the constraint applies.

primaryKey
Type: System.Boolean

Specifies whether the column should be the primary key. If true, the column will be a primary key column.

ExceptionCondition
ArgumentException

The constraint already belongs to this collection.

-Or-

The constraint belongs to another collection.

DuplicateNameException

The collection already has a constraint with the specified name. (The comparison is not case-sensitive.)

The CollectionChanged event occurs if the constraint is added successfully.

The following example creates an array of DataColumn objects that are used to create a new UniqueConstraint in a specific DataTable.

private void AddUniqueConstraint(DataTable table)
{
    DataColumn[] columns = new DataColumn[1];
    columns[0] = table.Columns["ID"];
    columns[1] = table.Columns["Name"];
    table.Constraints.Add("idNameConstraint", columns, true);
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

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