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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
)

Parameters

column
Type: System.Data.DataColumn

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

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0
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