Here us what you can do, say you have the situation like in MS sample:

// C3222.cpp
// compile with: /clr
#using <mscorlib.dll>
public __gc class G
{
  void f( int n = 0 );   // C3222
};You can workaround this problem by adding overloaded member function with
no parameters and call the original function from there:

// NoC3222.cpp
// compile with: /clr
#using <mscorlib.dll>
public __gc class G
{
  void f( int n );
  void f(void);
};

void G::f(int n){
   //do something with n here
}

void G::f(){
  f(100);
}