Creating, Altering, and Removing Rules
In SMO, rules are represented by the Rule object. The rule is defined by the TextBody property, which is a text string that contains a condition expression that uses operators or predicates, such as IN, LIKE, or BETWEEN. A rule cannot reference columns or other database objects. Built-in functions that do not reference database objects can be included.
The definition in the TextBody property must contain a variable that refers to the data value entered. Any name or symbol can be used to represent the value when creating the rule, but the first character must be the @ symbol.
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How to: Create, Alter, and Remove a Rule in Visual Basic .NET