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Question 1: A class library named MathLib contains the following code.public class MathClass :
MarshalByRefObject { public decimal DoHugeCalculation(int iterations) { decimal result;
//Some very lengthy calculations ... return result; }}The MathLib class is hosted in a .NET
Framework remoting server application. A Windows application project running on a client
computer contains the following class.public class MathClient { public void
ProcessHugeCalculation(int iterations)
{ MathClass cm = new MathClass(); decimal decRes = cm.DoHugeCalculation(iterations);
//process the result ... }}The MathClient class must call the MathClass class asynchronously
by using remoting. A callback must be implemented to meet this requirement. You need to
complete the implementation of the MathClient class. What should you do?
A. Modify the MathClient class as follows:public class MathClient {public delegate void
DoHugeCalculationDelegate(decimal result);public event DoHugeCalculationDelegate
DoHugeCalculationResult;public void DoHugeCalculationHandler(decimal result)
{DoHugeCalculationResult(result);} public void ProcessHugeCalculation(int iterations) {
//Hook up event handler here... ... }}
B. Apply the Serializable attribute to the MathClient class.
C. Modify the MathClient class as follows:public class MathClient { private delegate decimal
DoHugeCalculationDelegate(int iterations); private void
DoHugeCalculationCallBack(IAsyncResult res) { AsyncResult aRes = (AsyncResult)res;
decimal decRes = ((DoHugeCalculationDelegate)aRes. AsyncDelegate).EndInvoke(res);
//process the result ... } public void ProcessHugeCalculation(int iterations) { MathClass cm
= new MathClass(); DoHugeCalculationDelegate del = new
DoHugeCalculationDelegate( cm.DoHugeCalculation);
del.BeginInvoke(iterations, new
AsyncCallback( DoHugeCalculationCallBack), null); }}
D. Apply the OneWay attribute to all methods in the MathClass class.
Correct Answer: C

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