Question
You ASP.NET application manages order entry data by using a DataSet object named
TKorderEntry. The TKorderEntry object includes two DataTable objects named orderNames and OrderDetails. A ForeignKeyConstraint object named orderDetailsKey is defined between the two DataTable objects. You attempt to delete a row in orderNames while there are related rows in OrderDetails, and an exception is generated.
What is the most likely cause of the problem?

A. The current value of OrderDetails.KeyDeleteRule is Rule.Cascade.

B. The current value of OrderDetails.KeyDeleteRule is Rule.SetNull.

C. The current value of OrderDetails.KeyDeleteRule is Rule.SetDefault.

D. The current value of OrderDetails.KeyDeleteRule is Rule.None.
Answers
Answer: D


Explanation: The rule enumeration indicates the action that occurs when a ForeignKeyConstraint is enforced. None specifies that no action will occur, but exceptions are generated. This is what has occurred in this scenario.
Reference: .NET Framework Class Library, Rule Enumeration [C#]
Incorrect Answers
A: Cascade specifies that all rows containing that value are also deleted.
B: SetNull specifies that values in all child columns are set to null values.
C: SetDefault specifies that all child columns be set to the default value for the column.   Your Comment




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