C#

public string StudentID
{
  get { return txtStudentID.Text; }
  set { txtStudentID.Text = value; }
}

• Turn on the managed extensions in the project. This is probably in Configuration Proerties labeled something like "Common Language runtime support"
  
• Add the following code to your stdafx.h or similar file.

  #using < mscorlib.dll >
  
  using namespace System;
  using namespace System::Runtime::InteropServices;

  
  
• Add the reference to your C# DLL to the unmanged project
  
• Create a manged variable using code like this:
  

  gcroot< ClassLibrary1::Class1* > c = new ClassLibrary1::Class1();
  
  int t=c->MyProperty;
  
  CString buff;
  buff.Format("data = %d",t);
  MessageBox(buff);
  c->ShowIt();

  
  
• Use the class instance using a ->
  

[GuidAttribute("9ED54F84-A89D-4fcd-A854-44251E925F09")]
class SampleClass{
     // Insert class members here
 }

public void MyMethod(int a)
{
  // Call the overload with your default param value.
  MyMethod(a, 3);
}
public void MyMethod(int a, int b)
{
}