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These methods begin, end, or cancel an edit operation on a DataRow object. This method marks this row to be removed when the AcceptChanges() method is called. This method gets a value indicating whether the specified column contains a null value.

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Property Let JobTitle(newJobTitle As String) m_sJobTitle = newJobTitle End Property Property Get Department() As String Department = m_sDepartment End Property Property Let Department(newDepartment As String) m_sDepartment = newDepartment End Property Property Get Email() As String Email = m_sEmail End Property Property Let Email(newEmail As String) m_sEmail = newEmail End Property Property Get Address() As cAddress Set Address = m_oAddress End Property Property Set Address(newAddress As cAddress) Set m_oAddress = newAddress End Property Property Get Equipment() As cEquipment Set Equipment = m_oEquipment End Property Property Set Equipment(newEquipment As cEquipment) Set m_oEquipment = newEquipment End Property Property Get Access() As cAccess Set Access = m_oAccess End Property Property Set Access(newAccess As cAccess) Set m_oAccess = newAccess End Property We ve added the remaining Person data elements to our class, as well as three object properties using Property Get/Set statements. We may also want to add a property that returns the employee s full name. Add the read-only FullName property to cPerson:

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Working with a DataRow is a bit different from working with a DataColumn, because you cannot create a direct instance of this type; rather, you obtain a reference from a given DataTable. For example, assume you wish to insert two rows in the Inventory table. The DataTable.NewRow() method allows you to obtain the next slot in the table, at which point you can fill each column with new data via the type indexer, as shown here: static void Main(string[] args) { ... // Now add some rows to the Inventory Table. DataRow carRow = inventoryTable.NewRow(); carRow["Make"] = "BMW"; carRow["Color"] = "Black"; carRow["PetName"] = "Hamlet"; inventoryTable.Rows.Add(carRow); carRow = inventoryTable.NewRow(); carRow["Make"] = "Saab"; carRow["Color"] = "Red"; carRow["PetName"] = "Sea Breeze"; inventoryTable.Rows.Add(carRow); } Notice how the DataRow class defines an indexer that can be used to gain access to a given DataColumn by numerical position as well as column name. At this point, you have a single DataTable containing two rows.

Anonymous methods are interesting in that they are able to access the local variables of the method that defines them. Formally speaking, such variables are termed outer variables of the anonymous method. To illustrate, assume our Main() method defined a local integer named aboutToBlowCounter. Within the anonymous methods that handle the AboutToBlow event, we will increment this counter by 1 and print out the tally before Main() completes: static void Main(string[] args) { ... int aboutToBlowCounter = 0; // Make a car as usual. Car c1 = new Car("SlugBug", 100, 10); // Register event handlers as anonymous methods. c1.AboutToBlow += delegate { aboutToBlowCounter++; Console.WriteLine("Eek! Going too fast!"); }; c1.AboutToBlow += delegate(string msg) { aboutToBlowCounter++; Console.WriteLine("Critical Message from Car: {0}", msg); }; ... Console.WriteLine("AboutToBlow event was fired {0} times.", aboutToBlowCounter); Console.ReadLine(); }

Once you run this updated Main() method, you will find the final Console.WriteLine() reports the AboutToBlow event was fired twice.

Another delegate-and-event-centric feature of C# is termed method group conversion. This feature allows you to register the simple name of an event handler. To illustrate, let s revisit the SimpleMath type examined earlier in this chapter, which is now updated with a new event named ComputationFinished: public class SimpleMath { // Not bothering to create a System.EventArgs // derived type here. public delegate void MathMessage(string msg); public event MathMessage ComputationFinished; public int Add(int x, int y) { ComputationFinished("Adding complete."); return x + y; } public int Subtract(int x, int y) { ComputationFinished("Subtracting complete."); return x - y; } } If we are not using anonymous method syntax, you know that the way we would handle the ComputationComplete event is as follows: class Program { static void Main(string[] args) { SimpleMath m = new SimpleMath(); m.ComputationFinished += new SimpleMath.MathMessage(ComputationFinishedHandler); Console.WriteLine("10 + 10 is {0}", m.Add(10, 10)); Console.ReadLine(); } static void ComputationFinishedHandler(string msg) { Console.WriteLine(msg); } } However, we can register the event handler with a specific event like this (the remainder of the code is identical): m.ComputationFinished += ComputationFinishedHandler;

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