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  • Question

  • You ASP.NET application manages order entry data by using a DataSet object named EXorderEntry. The EXorderEntry 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?


  • Options
  • 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.

  • Correct Answer
  • The current value of OrderDetails.KeyDeleteRule is Rule.None. 

    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.

     

    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.

    • More questions

    • 1. Which two descriptions are correct about characteristics of IPv6 unicast addressing? (Choose two) A. Global addresses start with 2000::/3. B. Link-local addresses start with FF00::/10. C. Link-local addresses start with FE00:/12. D. There is only one loopback address and it is ::1.
    • Discuss
    • 2. What are the six OSPF route types?
    • Discuss
    • 3. How many non- overlapping channels are available with 802.11b?

    • Options
    • A. 3
    • B. 12
    • C. 23
    • D. 40
      • Discuss
    • 4. Which IEEE committee has been sanctioned by WAP and is called WPA2?
    • Discuss
    • 5. When a station sends a transmission to the MAC address ff : ff : ff : ff : ff : ff, what type of transmission is it?

    • Options
    • A. Unicast
    • B. Multicast
    • C. Anycast
    • D. Broadcast
      • Discuss
    • 6. In the operation of CSMA/CD, which host(s) have priority after the expiration of the backoff algorithm?

    • Options
    • A. All hosts have equal priority
    • B. The two hosts that caused the collision will have equal priority
    • C. The host that sent the jam signal after the collision
    • D. The host with the highest MAC address
      • Discuss
    • 7. What is the Classs A Private IP address space?
    • Discuss
    • 8. What is the Class C private IP address space?
    • Discuss
    • 9. To use VLSM, what capability must the routing protocols in use possess?

    • Options
    • A. Support for multicast
    • B. Multi-protocol support
    • C. Transmission of subnet mask information
    • D. Support for unequal load balancing
      • Discuss
    • 10. If you wanted administrators to see a message when logging into the router, which command would you use?

    • Options
    • A. message banner motd
    • B. banner message motd
    • C. banner motd
    • D. message motd
      • Discuss

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