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Online Test DotNet 3.5 using C#

Which of the following are true about anonymous types?

  1. They can be derived from any reference type.

  2. Two anonymous types with the same named parameters in the same order declared in different classes have the same type.

  3. Anonymous types can have methods

  4. All properties of an anonymous type are read/write

Answer: Answer is b
Further Reading:

If two or more anonymous object initializers in an assembly specify a sequence of properties that are in the same order and that have the same names and types, the compiler treats the objects as instances of the same type. They share the same compiler-generated type information.Anonymous types contain one or more public read-only properties. No other kinds of class members, such as methods or events, are valid.Anonymous types are class types that derive directly from object, and that cannot be cast to any type except object. From the perspective of the common language runtime, an anonymous type is no different from any other reference type. Useful resources, Anonymous Types

Which of the following are true about using ADO.NET DataSets and DataTables?

  1. The connection to the database must remain valid for the life of the data objects

  2. All tables in a dataset must come from the same database.

  3. A given instance of a DataTable can be in only one DataSet

  4. Changes made to multiple tables within a DataSet can easily be extracted to a new DataSet which contains only the changes

  5. Content from multiple DataSets can easily be combined into a single DataSet that contains the net result of all changes.

Answer: Answer is d, e
Further Reading:

Useful resources,Dataset,   Datatable, multiple database table in singe dataset.

In the below code, which of the following other class constructors can directly access the provided constructor?

class Sample
{
  public Sample(int x)
  {
  }
}

  1. public Sample() : this(1) { }

  2. public Sample() : Sample(1) {}

  3. Both of the above

  4. One class constructor can not directly access another constructor

Answer: Answer is a
Further Reading:

Useful resources, C# Constructors

When Windows Communication Foundation is used to develop a Web Service, which of the following are supported?

  1. WS-Addressing

  2. WS-MetadataExchange

  3. WS-Security

  4. WS-Atomic Transaction

  5. All of the above

Answer: Answer is e
Further Reading:

Useful resources, WCF

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