System.Data.UniqueConstraint public class UniqueConstraint : Constraint Documentation public virtual DataColumn[] Columns { get; } public bool IsPrimaryKey { get; } public UniqueConstraint(DataColumn column) public UniqueConstraint(DataColumn column, bool isPrimaryKey) public UniqueConstraint(DataColumn[] columns) public UniqueConstraint(DataColumn[] columns, bool isPrimaryKey) public UniqueConstraint(string name, DataColumn column) public UniqueConstraint(string name, DataColumn column, bool isPrimaryKey) public UniqueConstraint(string name, DataColumn[] columns) public UniqueConstraint(string name, DataColumn[] columns, bool isPrimaryKey) public UniqueConstraint(string name, string[] columnNames, bool isPrimaryKey)