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UniqueConstraint Constructor (DataColumn)

Initializes a new instance of the UniqueConstraint class with the specified DataColumn.

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

public UniqueConstraint (
	DataColumn column
)
public UniqueConstraint (
	DataColumn column
)
public function UniqueConstraint (
	column : DataColumn
)

Parameters

column

The DataColumn to constrain.

The following example creates a new UniqueConstraint and assigns it to the ParentKeyConstraint property of a DataRelation.

Private Sub CreateUniqueConstraint(ByVal dataSetSuppliers As DataSet)
    Dim uniqueConstraint As UniqueConstraint

    ' Get the DataColumn of a table in a DataSet.
    Dim dataColumn As DataColumn
    dataColumn = dataSetSuppliers.Tables("Suppliers").Columns("SupplierID")

    ' Create the constraint.
    uniqueConstraint = New UniqueConstraint("supplierIdConstraint", dataColumn)

    ' Add the constraint to the ConstraintCollection of the DataTable.
    dataSetSuppliers.Tables("Suppliers").Constraints.Add(uniqueConstraint)
End Sub

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
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