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DataRelation Constructor (String, DataColumn, DataColumn, Boolean)

Initializes a new instance of the DataRelation class using the specified name, parent and child DataColumn objects, and a value that indicates whether to create constraints.

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

public DataRelation(
	string relationName,
	DataColumn parentColumn,
	DataColumn childColumn,
	bool createConstraints
)

Parameters

relationName
Type: System.String
The name of the relation. If null or an empty string (""), a default name will be given when the created object is added to the DataRelationCollection.
parentColumn
Type: System.Data.DataColumn
The parent DataColumn in the relation.
childColumn
Type: System.Data.DataColumn
The child DataColumn in the relation.
createConstraints
Type: System.Boolean
A value that indicates whether constraints are created. true, if constraints are created. Otherwise, false.

ExceptionCondition
ArgumentNullException

One or both of the DataColumn objects contains null.

InvalidConstraintException

The columns have different data types

-Or-

The tables do not belong to the same DataSet.

The following example creates a new DataRelation and adds it to the DataRelationCollection of a DataSet.



 Private Sub CreateRelation()
    ' Code to get the DataSet not shown here.
    ' Get the DataColumn objects from two DataTable 
    ' objects in a DataSet.
    Dim parentColumn As DataColumn = DataSet1.Tables( _
        "Customers").Columns("CustID")
    Dim childColumn As DataColumn = _
        DataSet1.Tables("Orders").Columns("CustID")

    ' Create DataRelation.
    Dim bConstraints As Boolean = True
    Dim customerOrdersRelation As DataRelation = _
        New DataRelation("CustomersOrders", _
        parentColumn, childColumn, bConstraints)

    ' Add the relation to the DataSet.
    DataSet1.Relations.Add(customerOrdersRelation)
End Sub


.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

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.

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