Apparently , with this code (below), it would be quite difficult . But the code you posted in the second post might be transformed to work with .NET . Do you have working example in VB6 ?
VB Code:
  1. typedef struct {

  2. DWORD lStructSize;

  3. HWND hwndOwner;

  4. HINSTANCE hInstance;

  5. DWORD Flags;

  6. LPTSTR lpstrFindWhat;

  7. LPTSTR lpstrReplaceWith;

  8. WORD wFindWhatLen;

  9. WORD wReplaceWithLen;

  10. LPARAM lCustData;

  11. LPFRHOOKPROC lpfnHook;

  12. LPCTSTR lpTemplateName;

  13. } FINDREPLACE, *LPFINDREPLACE;