DataColumn::Unique Property
.NET Framework (current version)
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)
Property Value
Type: System::Booleantrue if the value must be unique; otherwise, false. The default is false.
| Exception | Condition |
|---|---|
| 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.
.NET Framework
Available since 1.1
Available since 1.1
Show: