Does the following code cause a memory leak in .NET?

Void Function1()
{
hFile= CreateFile(static_cast<const char
*>(Marshal::StringToHGlobalAnsi(s).ToPointer()),
                    GENERIC_WRITE,                
                    0,                            
                    NULL,                          
                    CREATE_ALWAYS,                
                    FILE_ATTRIBUTE_NORMAL,        
                    NULL);                        

}
The part that I am concerned about here is the
Marshal::StringToHGlobalAnsi.  When is the const char * destroyed or
is it?

Thanks

Ron