Exception handling in Managed C++

/*******************************************************************************************


  File Name				:		Exception.cpp
  Platform				:		Visual C++ .NET
  Aut					:		Selvam.R
  Des					:		Exception Handling in Managed C++ Sample



*********************************************************************************************/

#using <mscorlib.dll>
#using <System.Windows.Forms.dll>

using namespace System;
using namespace System::Threading;
using namespace System::IO;
using namespace System::Windows::Forms;


// Display the Exeception Details
void DisplayMessage(String *exType,String *exMessage,String *exStack)
{
	 Console::WriteLine ("Exception Type:\n   {0}", exType);
     Console::WriteLine ("Exception Des:\n   {0}", exMessage);
     Console::WriteLine ("Stack Trace out:\n{0}", exStack);
}

// Divide by Zero Exception
void DivideException()
{

	int i = 0;

	try{
        
		i=300/i;
	
      }catch(Exception *e)
	{DisplayMessage(e->GetType()->ToString(),e->Message,e->StackTrace);} 


}

//Null Object reference Exception
void NullException()
{
      
      Object *obj = (Object *)0;

	  try
	  {
            Console::WriteLine(obj->ToString());
	  }catch(Exception *e)
	{DisplayMessage(e->GetType()->ToString(),e->Message,e->StackTrace);}  
  
     
}

// File Notfound Exception
void FileException()
{

	try
	{
     
		FileStream *fs = new FileStream("data.txt", FileMode::Open);
        StreamReader *sr = new StreamReader(fs);
        
    }
    catch(FileNotFoundException *e)
    {DisplayMessage(e->GetType()->ToString(),e->Message,e->StackTrace);}        

}


// User defined Exception
__gc class MyException:public ApplicationException
{
   public: 
      MyException(String *msg):ApplicationException(msg)
	  {
		  
		  Console::WriteLine(msg);
	  }
};


// Main function in the Exception handling 
int main()
{
	//declare the variable
	char ans;
	Console::WriteLine("\t\t Exception Handling ");
	Console::WriteLine("\t\t ****************** ");
	Console::WriteLine("\t\t 1==>Divide By Zero Exception");
	Console::WriteLine("\t\t 2==>Null Object Exception");
	Console::WriteLine("\t\t 3==>File Exception");
	Console::WriteLine("\t\t 4==>User Defined Exception ");

	// Read from user input
	ans=Console::Read();
	
	switch(ans)
	{// Start switch statement
	case '1':
		DivideException();
		break;
	case '2':
		NullException();
		break;
	case '3':
		FileException();
		break;
	case '4':
		throw new MyException("This is my exception");
		break;
	default:
		Console::WriteLine("Please chose currect Exception [1-4]!");
		
	}// end switch

  return 0;
	
}// end main