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You use an object of the UniqueConstraint class to ensure that a DataColumn value, or combination of DataColumn values, is unique for each DataRow in a DataTable. The UniqueConstraint class is derived from the System.Data.Constraint class. Table 12.1 shows the UniqueConstraint properties.
PROPERTY | TYPE | DESCRIPTION |
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Columns | DataColumn[] | Gets the array of DataColumn objects for the UniqueConstraint. |
ConstraintName | string | Gets the name of the UniqueConstraint. |
ExtendedProperties | PropertyCollection | Gets the PropertyCollection object that you can use to store strings of additional information. |
IsPrimaryKey | bool | Gets a bool that indicates whether the UniqueConstraint is a primary key. |
Table | DataTable | Gets the DataTable on which the UniqueConstraint was created. |
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