Gets or sets a value that indicates whether the values in each row of the column must be unique.
Assembly: System.Data (in System.Data.dll)
As soon as this property is changed from false to true, a unique constraint will be created on this column to make sure that values are unique.
The following example creates new DataColumn, sets its properties, and adds it to a table's columns collection.
Private Sub AddColumn(table As DataTable) ' Add a DataColumn to the collection and set its properties. ' The constructor sets the ColumnName of the column. Dim column As DataColumn = New DataColumn("Total") column.DataType = System.Type.GetType("System.Decimal") column.ReadOnly = True column.Expression = "UnitPrice * Quantity" column.Unique = False End Sub
Available since 1.1