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DataColumn.Unique Property

Gets or sets a value that indicates whether the values in each row of the column must be unique.

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

member Unique : bool with get, set

Property Value

Type: System.Boolean
true if the value must be unique; otherwise, false. The default is false.

ExceptionCondition
ArgumentException

The column is a calculated column.

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.

No code example is currently available or this language may not be supported.

.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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