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UniqueConstraint Constructor (DataColumn)

.NET Framework 4

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
)

Parameters

column: Type: System.Data.DataColumn
The DataColumn to constrain.

Examples

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

Version Information

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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

Reference

UniqueConstraint Class

UniqueConstraint Overload

System.Data Namespace

Other Resources

DataTable Constraints (ADO.NET)

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